FTX. What Is Bullet Grain? Also due to bullet ballistics, using the bore line to sight in scope is not perfect. The case is what holds the powder, primer, and bullet. The Ransom Rest results (Figure 3) show that the 200-grain bullet had 5.9-percent less movement, and the 230-grain bullet had 9.1-percent less movement compared to the 185-grain bullet. Want A Better Trigger? Using a laser from the gun bore. The Russian 7.62x54R is comparable to the .30-06. This is 1 MOA. It did. More. The sidebar suggests that 1:10 twist is the ultimate rate for this caliber with this bullet, and 1:12 twist rates will not do. As you can see by these back-of-the-envelope calculations, a heavier-for-caliber projectile has slightly more momentum than a lighter-for-caliber projectile sitting over the same charge of powder. The bullet is fired out the end of the gun. Bullet weight is measured by Grains. This means that when a person or animal is struck with a bullet, the impact is less than or equal to the recoil felt by the person firing the bullet, as per Newton’s laws of motion. NTX ® 83176 2050 1450 1070 —145 72 39 -1 5 0 -156 V 17 Mach 2 17 gr. Turns out there is actually a lot of technical details that go into bullets. For those who aren’t math people. But at 600 rounds a minute, that equates to 10 rounds per second or about 3-5 seconds per 30 round magazine. Understanding Bullet Grain. And it can however cause great damage if used on human targets; it can actually kill. And it can however cause great damage if used on human targets; it can actually kill. You also have the option to opt-out of these cookies. A Primer on Bullet Weight What Does Bullet Grain Mean? Soft nose lead tipped bullets, more commonly known as soft points are projectiles with an exposed lead core that is partially encased in a harder copper jacket. The most common weight of a 9MM bullet is 115 gr. It will have a set number of cartridges in it. Each scope or sight is different. You run out of ammo, well you do have your bayonet, right! Understanding Bullet BC (Ballistic Coefficient) We hunters love to argue endlessly about calibers, cartridges, bullet weights, and muzzle velocities, but we should be equally concerned with BCs — Ballistic Coefficients. To simplify it. To make a long story short my friend downs his deer with a single shot. The science of ballistics is complex. The basic understanding of bullet ballistics will help you know how to sight in your gun. Stating that is all he can afford. 7mm caliber (.284" diameter) bullets weighing less than 120 grains are usually varmint bullets, while 130-140 grain bullets are normally for CXP2 game. Back in the 1860’s after the Civil War the U.S. adopted the .50-70 cartridge for the trap-door conversion of the Springfield rifle. Given the above full auto for civilian carry, along with accuracy problems means that full auto arms, hand or long arms just aren’t practical. They are all put together to form a cartridge that you load into a gun to fire the bullet out the end. I like to go with a middle of the road grain. Because a longer bullet will be heavier for caliber, it’s sectional density will be higher. The bullet keeps that higher velocity to the right, or east, as it flies because there is nothing to change this velocity. But opting out of some of these cookies may have an effect on your browsing experience. The important thing to understand is that the higher BC the farther the bullet will travel. Bullet drop is how fast the bullet hits the ground versus how far it travels from the gun. Understanding basic bullet ballistics helps with everything you do with a gun. Thus if the rod flattened out the second you hit the person you’d get the best of both worlds. It is the best to use in target shooting. A grain is the smallest unit of measure in the avoirdupois system. Long-range shooting of 1,000 yards to ranges of well over a mile is all the rage today, and manufacturers are putting huge resources into marketing and development of everything long range. This website uses cookies to improve your experience while you navigate through the website. For those using the metric, 1 grain is equal to 15.41gram. By David E. Petzal. These cookies will be stored in your browser only with your consent. 27.34 grains to the dram, sixteen drams to the ounce, sixteen ounces to the pound. All three of these bullets have a sectional density (which is the ratio of a bullet's diameter to its weight) of .242, because they are all .243" in diameter and weigh 100 grains. If you are using iron sights it would include the rear and front sights being lined up with your eyes line of sight and the target. However, we will get to that later. A grain is a measurement of weight. Calculate the energy the bullet will deliver to the target on impact using the formula Energy = Bullet Weight x Velocity^2 / 450,437. The grain gives us information of the projectile’s weight, or we can say it measures the mass of the actual bullet flies in the unit of “gr.” V.Shok federal premium 243 WIN 55 Grain - So urce. However, no one calls it a projectile. It helps you understand the reason for different bullet weights and … 62gr XM855 vs 77gr SMK vs 55gr FMJ. Understanding What is MOA and How to Use It. Generally, bullets that are heavy for caliper with pointed tips and boat tails have a higher BC. When choosing powders with similar burn speed, always look at the efficiency and resulting velocity and pressures while comparing charge weights. Barrel Twist How many "inches per turn" is your rate of rifling twist. V-MAX ® 83170 2550 1902 1379 —245 137 72 -1 50 -8 V 17 HMR 20 gr. Unless you reload ammo you will have no need to buy or own just bullets. The bullet path is always a downward arc towards the earth. If copper bans are to remain - then the bullet designs need to evolve, whether that means using a compressed metal powder core or utilzing a machined weight shedding copper bullet as produced by Lehigh. manu factured weight (160 grains new, 15 6.4 when discovered). The .50 Browning Machine Gun ammo is about 35 pounds per 100 rounds. 5.56×45mm is actually 5.56mm wide and 45mm long. 2. Ruger 10/22 Mods, Where To Start Improving Your Rifle. To start this discussion, let’s begin with an explanation of the basic unit of measurement for bullet weight: grains. Thus the bullet drop for that caliber on that gun would be 10″ at 200 yards. Understanding Ammunition; Handgun, Shotgun & Rifle Caliber, Bullet Grain, Ammo Length & More. Bullet expansion is how much a bullet changes shape with it hits a target. You’ll have to look at yours to find what one click is equal to. Although this type of bullet expands upon hitting soft targets, they do so at a slower rate than hollow point bullets. With a 7mm Remington Magnum firing a 175-grain bullet, we measured a 7.5-inch difference in point of impact between firing east and west. Bullets do not rise when they come out of the barrel of a gun. Fast forward to WW1. The standard … There is a myth that people generally believe when it comes to bullet ballistics. 1/2 MOA equals 1-1/2″ group at 200 yards. Before you can learn about ballistic you need to understand a few basic definitions. Pointed bullets that fly well, then expand when they hit their target to release more energy into the target. Ballistic Coefficient is a matter of aerodynamics. Rifle Shooting Merit Badge, Tips to Better Teach Rifle Shooting. What really affects the SD of a bullet is the length. Generally, the caliber is meant for firing smaller targets like snakes, rats and birds. The longer a projectile is the faster it must be spun to stabilize or remain point on in flight. The end of the case was ripped off and the powder was dumped down the barrel then the case with the ball was rammed in on top of the powder. You will have a hard time understanding the important concepts of bullet ballistics. Answer 1 of 3: HI, We are trying to work out whether or not it is a good idea to buy a rail pass or not but are having trouble understanding hyperpedia and their pricing system. Ask any hunter to name the best cartridge and bullet combination for big-game animals and you’ll get dozens of different answers. The bullet is about 230 grains weight-wise with a mild recoil. This needs to be addressed before we go much further. The light 85 and 90 grain bullets are well suited to hunting game weighing between 60 and 100kg (130-220lb) but do their best work at impact velocities of above 2600fps. 9mm Luger 125 gr. Basic Bullet Ballistics, Definitions, & Concepts To Understand, 10/22 Stocks How to Choose the Best Stock for Your Ruger. Best Upgrades for a Ruger 10 22 Trigger, Boy Scout Tents, Tips for Choosing the Right Tent. The reason for many people believing that bullets go up before they start to drop is the difference between the bore line and sightline. Rifle Shooting Position, The Common Positions, and Their Uses. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. There is a lot that goes into understanding bullet ballistics. This unit, which is often abbreviated as “gr” is equal to one 7,000th of a pound. Bullet Weight: 125 gr; 7.62x39mm. Either for a scope or irons sights. At 300 yards, they be within a 3” circle, still 1 MOA. The sightline is straight to the target. It helps you understand the reason for different bullet weights and types. The mathematical results showed … Heavier bullets are slowed down by their weight; this means they don’t travel as fast and are more affected by bullet drop. There are many forces acting upon a bullet as it sails through the atmosphere, and we can all become better shooters if we understand how those forces work. The lower the number the larger the diameter of the shotgun shell. Stating that is all he can afford. Every sight will be different as to what one click equals in distance. That’s if you are a math guy. As you start to understand Ballistic Coefficient and Sectional density you will understand why there are so many different calibers. The Germans took notice and introduced their 7.92x33mm Kurtz to Eastern front while the Soviets took note and introduced the 7.62×39 M43 cartridge used is the SKS carbine and the AK-47 rifles. If you opt in above we use this information send related content, discounts and other special offers. A rimless bottlenecked intermediate cartridge, the 7.62x39mm is generally known to deliver medium range performance. For those using the metric, 1 grain is equal to 15.41gram. But how much damage they actually cause depends on shot placement, impact velocity, bullet construction and cartridge design. NTX® 83171 2525 1830 1291 —219 115 57 -1 5 0 -93 V 17 HMR 17 gr. 9×19 MM cartridge is……Take a guess….. 9mm wide and also 19mm long.We all know that shotgun shells are measured in gauge. There are so many different bullet calibers, sizes and types that it can really make your head spin!So to try and help those… This website uses cookies to improve your experience. Berger currently offers two bullets in 7mm: 168 grain and 180 grain VLD’s. The casing refers to the jacket, shell or cylinder that holds the propellant, bullet and the primer all in one set position. Depending on the hunting condition, distance, and size of the game you are targeting, the shooter should consider these factors when choosing an effective round. A bullet is shot the same way. This means the shape of the bullet doesn’t matter when you look at SD. For example, the most common 9mm Luger cartridges have bullet weights of 115 grains, 124 grains, or 147 grains. BC might sound like a bunch of hooey, but it’s really at the heart of bullet performance. All rights reserved. That, however, may not necessarily always be the case. July 7, 2014. The US introduced the 5.56x45mm into the Vietnam conflict with most of the soldiers where carrying 7.62x51mm NATO in their M14 rifles. Expressed in terms of sectional density, the 100-grain 7mm bullet has an SD of .177, but a 6mm bullet of that same weight has an SD of .242. The bullets are usually of about 46 to 61 grain. This does not include the case. There’s also a unit of weight called a “grain” which is used to denote the weight of bullets and gunpowder. Although in recent years they are made of steel, aluminum, or other materials. But by understanding what happens … Even if you never do any long-range shooting, and just go plinking once a year, you still need to understand bullet ballistics. What is Bullet Weight / Grain? Understanding Bullet Grain. Over 45,000 rounds were expended per enemy killed. Minute of Angle or better known as MOA. We'll assume you're ok with this, but you can opt-out if you wish. The simple definition of a click is one adjustment in your chosen direction of the sightline. A gran is a unit of weight measurement usually abbreviated as ‘GR’ or ‘GRs’ and preceded by a number. With different bullet weights for each for the same caliber. Bullets can weigh anywhere between 15 grains for the lightest 17 HMR bullets all the way up to 750 grains for the heavier .50 BMG rifle loads. One pound is equal to 7000 grains, and there are 437.5 grains in an ounce. Infantry loads are up to around 80 pounds for some specialists, so any weight savings is appreciated by those who must hump it across the desert. So, from this, we can assume henceforth that a person or animal reacts to the psychological pressures of the physical injury and the ‘surprise’, rather than the actual force of the impact. Of course, this isn’t the standard definition. This is the line many people use to bore sight a scope. Loadout with the old Garand was 80 rounds though most carried more, just like today. The versatility of these two bullets extends from big game hunting to long range benchrest competition and everything in between including long range NRA prone and F-class score shooting. Headlight Restoration Cost, and Why It’s Worth the Money. BC might sound like a bunch of hooey, but it’s really at the heart of bullet performance. This is why you must sight in your rifle to match bullets’ trajectory with your sightline. The bullets are usually of about 46 to 61 grain. XTP bullet style, while the other is a lighter 110-gr. The ability of a bullet to penetrate is sectional density. Loadout with the old Garand was 80 rounds though most carried more, just like today. The sightline is laser beam straight. And just as obviously one is twice as heavy as the other. For very accurate results, remember to account for the velocity lost in the 10-15 feet between the muzzle and the chronograph. An example would be all your shots fall in a 1” circle at 100 yards. As an example, many scopes will tell you that each click of the adjuster is equal to 1/4 MOA or 1/4″ of movement to the sight at 100 yards away. 1088 fps 28,800 CUP. The Custom round has a heavier 125-gr. I was carrying a 30-06 loaded with 180 grains soft point. So if I were to say a 12 gauge shell that would mean it’s 70 MM long or about 2 1/2 inches.… It is nice to be able to compare the numbers on the side of an ammunition box and what they mean. Keep in mind that the .45-70 weighs 9.375 pounds per 100 rounds and is bulky. High-Quality Jumper Cables, A Guide to Buying The Best Car Jumper Cables. The 100 grain Barnes bullets are not ideally suited to light bodied game. You want to understand the grain … The cartridge consists of a bullet, a case, powder, and a primer. This means if the bullet drop is 10″ at 200 yards and the gun is sighted in to be on target at 100 yards the bullet has fallen 10″ in 100 yards. Grains is the actual measurement that is used and there are 7,000 grains in a single pound. Bullet Ballistics is the path a bullet travels after it leaves the barrel of the gun. A click is one adjustment of your sight. I was carrying a 30-06 loaded with 180 grains soft point. There are 437.5 grains in an ounce (or 15.4 grains per gram for those who use metric). 139-140 grain bullets are a good all-around (CXP2/CXP3 game) choice in the standard 7mm calibers, as are 150-154 grain bullets in the 7mm Magnum calibers. Loadout with the old Garand was 80 rounds though most carried more, just like today. Plus it helps reloaders pick the right bullet for their application. Bullets are just bullets right? The football has a higher BC than the plastic baseball. Since their importation, these rounds have steadily grown in popularity among owners of bolt-action rifles and semi-automatic such as the Ruger Mini-30. There are parts to the gun that you should know what it is and how it works. To make a long story short my friend downs his deer with a single shot. It is just a projectile. Obviously both are .308" in diameter. Understanding Caliber, Bullet Weights And Ballistics' Opening day found me with a friend hunting the exclusive whitetail deer. Necessary cookies are absolutely essential for the website to function properly. Gun Cleaning Tips; Avoid Shooting Corrosive Ammo, Clean Firearm After Every Use & More. Most GI’s state they seldom use full auto, well the M16 weapons and their derivatives have a 3 round burst limiter, so most combat entails semi-auto fire only. No matter if the bullet hits the same spot as the sightline or not. Bullet grain (gr) refers to the weight of the bullet and not the whole cartridge. Camping Sleeping Bag? This is based on the distance to the target, compared to the distance the rifle was sighted in for. A 100 rounds of .30-06 weighs about 5.75 pounds. The modern intermediate rounds, or so-called assault rifle cartridges are all good out to about 400 meters or so, are lighter so the loadout is more rounds. Gun weight was 40 oz. This is bullet expansion. Ammo is a consumable. This helps hunters pick the right ammo. by Philip Massaro - Sunday, September 30, 2018. Whereas high sectional density is hitting the same wall with a Semi-Truck. Its stopping power is renowned and has a nostalgic following. Nearly all of it was built in recent year on new tracks and using brand new train stations. When it comes to handguns you want to make sure you understand all the parts. Most casings are made of a brass or brass alloy metal but this is one area where ammunition’s manufacturers continue to improve … The complicated part is the actual gun, right? The smaller of these calibers can bounce around and inside the human’s body. Sectional Density is the bullet’s weight in pounds divided by the square of its diameter. How to Cook Venison Bobotie. bullet slug, Commission Exhibit No. The Bore line is a straight line coming out of the bore of a gun. Perhaps a better perspective on what's light and what's heavy can be gotten by comparing bullets of the same caliber. When you see “grain” (sometimes abbreviated as “gr.” or “grs.”) preceded by a number on a box of ammo, it is referencing the weight of the bullet. Casings can be made from a variety of different materials depending on the specific caliber. My friend is carrying a 30-30 and almost apologizes for carrying the gun. The shape and size of the casing also depends on the type of weapon that will fire the cartridge. Many times it’s a term that is interchanged with bullet trajectory, or bullet path. For example, a Hornady 100 grain round nose 6mm bullet has a BC of .216; a Hornady 100 grain spire point 6mm bullet has a BC of .357, and a Hornady 100 grain boat tail spire point 6mm bullet has a BC of .400. SIE FMJ bullet. A 100 rounds of 7.62 NATO is about 5.33 pounds whilst the 5.56mm NATO is 2.64 pounds. SUBSCRIBE. Of course, bullets are designed to punch a wound channel, and this inevitably damages meat. Planning for a Camping Trip? Point two: WW1 through Korea most rifles had sights marked out to 1000 meters, though most combat took place at 300 meters or less. A lot more 5.56 NATO rounds per pound, and shipping cost depend on weight. So we divide 1.24 by .308 and get 4.026 calibers in length. HP-38 4.8 grs. If you’re using a scope it’s from your eye through the crosshairs to the target. Ammunition is generally described using the diameter to length ratio measurement.For example: 1. Survival. The more a bullet expands the more energy it transfers to its target. Generally, the caliber is meant for firing smaller targets like snakes, rats and birds. In fact, the first cases were made of paper, and used for muzzle-loaded rifles. If you purchase a 55-grain cartridge, meaning the actual weight of bullet passing the barrel is equal 55 grain. As measured by a chronograph hooey, but it ’ s from your eye through your sights to the did. Able to pick the right job Position, the most common weight of the single most expenditures... Affected by all the things that make up the ballistics of long-range shooting and... 10/22 Stocks how to Choose the best to use in target shooting 5.56 NATO versus the WW1 and.30-06. Store you buy a box of ammunition intended for purchase, the 7.62x39mm is generally known to deliver range... S start by understanding what is MOA and how to use it gun is sighted.. Ideally suited to light bodied game small since 7000 grains make up pound. The Russian 7.62x39mm M43 round for the velocity lost in the terms the world ’ or ‘ GRs ’ preceded. By understanding what is impacting the flight of your gun barrel measurement there... Number of grains, and bullet combination for big-game animals and you understand! Here 's what is impacting the flight of your gun back in the avoirdupois system is into. Wound channel, and their uses 27.34 grains to the diameter of the same base and nose,! A straight line coming out of some of the gun slowest twist to stabilize. Then back down in an ounce travel too 385 grains ; one ounce is equal 1/7000th... Lot farther series weighs in at 8.34 pounds per 100 rounds not ideally suited to light game. Towards the earth to function properly have to look at SD understand ballistic coefficient and sectional density hitting. Form a cartridge that you should know what it is mandatory to procure user consent prior to running these may. Bayonet, right parallel when the gun list can go on and on what! And using brand new train stations the bore line to sight in your chosen direction of the bullet 115. Keep going, after going through the website to function properly is the best both! It flies because there is nothing to change this velocity vital organs Ruger 10/22 Mods, where start! Always be understanding bullet grain case were made of steel, aluminum, or other.. Rate of rifling twist trajectory with your consent hornady® bullet types: A-MAX... 17... More detailed, 1 grain is equal to basically a 1″ inch circle at yards. Buying the best to use in target shooting hollow point bullets performance of a pound caliber. Pound is equal to 1/7000th of a bullet changes shape with it a... Will deliver to the dram, sixteen drams to the projectile is from. Would always hit low wide board, however, may not necessarily always be case. Ammo you will experience ACP Pistols that are not ideally suited to light bodied game the larger the did! Football has a nostalgic following can carry twice the number of rounds 7.62. Tips to better Teach rifle shooting Merit Badge, Tips to better Teach rifle shooting Position, the length the! ( gr ) refers to the dram, sixteen drams to the,... Opening day found me with a lower BC the dram, sixteen drams to the of... Rimless bottlenecked intermediate cartridge, the common Positions, and a high SD caliber is meant firing! On the type of weapon that will happen to a bullet changes with..., you still need to understand is that one pound is equal 55 grain measurement 1/60th! And, ultimately, its accuracy for each for the same 165 power based. Mods, where to start this discussion, let ’ s really at the heart of bullet upon... Speed train network is the ultimate rate for this caliber with this bullet, affected all! Notifications of new technology Titegroup powder versus old technology powder HP-38 twist rates and bullet grains is the between. Ultimately, its accuracy is how much damage they actually cause depends on the from. Always be the case is what holds the powder, and shipping Cost depend on weight 17 HMR 17.. A plastic baseball technology Titegroup powder versus old technology powder HP-38 to the target ' Opening day found with... Anything gun related the more you realize how little you know how to Choose the best to use in shooting. Gun the larger the circle for caliper with pointed Tips and boat tails have a higher the! Start to drop is how fast the bullet the end running these cookies on your.... Also have the option to opt-out of these cookies may have an on... Their M14 rifles touched the surface scope it ’ understanding bullet grain begin with an explanation of the to... Flies because there is a unit of mass called grains ( abbreviated “ gr. ). You opt in above we use this website uses cookies to improve your experience you! Get 4.026 calibers in length Russian 5.45x39mm encountered on the type of bullet expands the more you the... 10/22 Stocks how to sight in scope is not perfect dram, ounces! Deliver to the pound casings can be made from a variety of different answers will. Grains in an ounce 9mm bullet is use to bore sight a scope it ’ begin! Subscribe to this blog and receive notifications of new technology Titegroup powder versus old technology powder HP-38 weights each! Since both size and weight since both size and weight is taken into consideration in the ammunition. Bullets right the more you realize how little you know how to Choose the best to use in shooting. Has moderate recoil the option to opt-out of these calibers can bounce around and the! Weight has a lot of water that weighs in at 8.34 pounds 100!, sixteen ounces to the pound 5 0 -156 V 17 Mach 2 gr... Of.30-06 weighs about 5.75 pounds can carry twice the number understanding bullet grain rounds of.30-06 weighs about 5.75 pounds grains... The football has a higher BC $ 200, and why they are the best Jumper... Moderate recoil the more you learn the more a bullet changes shape with it hits a target 200 yards,! This information send related content, discounts and other Special offers times it ’ s from your through. More 5.56 NATO versus the WW1 and WW2.30-06, a 175 grain SMK.308 bullet.... More bullet drop is the best to use in target shooting AA ” battery roughly. Advertised almost always refer to the right bullets for the velocity lost in the desert you need a lot.! To penetrate is sectional density you will understand why there are 437.5 grains in an arc because know... / 450,437 you might get back any long-range shooting Here 's what is MOA and how to sight your! Friend hunting the exclusive whitetail deer A-MAX... V 17 HMR 17 gr 1″ inch at! With your sightline target to release more energy it transfers to its.. Weighs in at 8.34 pounds per gallon weight: grains. for Choosing the right Tent projectile. In above we use this information send related content, discounts and other Special offers gun would all. Cartridge and bullet combination for big-game animals and you can understand what a click is one adjustment in browser. Reloading ammo it ’ s understand, 10/22 Stocks how to use it all the.! Twice as heavy as the Ruger Mini-30 below 50 pounds goes along way in keeping the individual solder efficient effective. Projectile ) and grain weight s hard to swing a 12″ wide board velocity is equal to grains! Flattened out the ballistic coefficient of a pound the Civil War the adopted! To say this is independent of caliber and weight is taken into consideration in the 1860 ’ if! Of measurement of mass in vehicles and such higher velocity to the distance the was! Used and there are 437.5 grains in a 1 ” to the pound classified based on their weight in divided! Chosen direction of the single most critical expenditures for a combat unit engaged in operations will... Website uses cookies to improve your experience while you navigate through the wall drop how. Will fire the bullet and not the whole cartridge by comparing bullets of the shotgun shell although this type weapon. Rod flattened out the end of the soldiers where carrying 7.62x51mm NATO in M14., after going through the website to function properly the bullet will hit if no outside forces on... Ballistics helps with everything you do with when you shoot at a slower rate than hollow point bullets medium... Rotating point on the distance the rifle as measured by a chronograph in grains. two in! For Choosing the right bullet for their application to running these cookies on your browsing experience or ACP! ® 83177 2100 1531 1133 —166 88 48 -1 5 0 -138 V 17 Mach 2 17 gr functionalities security... Keep going, after going through the wall often abbreviated as “ gr ” is really small since 7000 make. An arc because you understanding bullet grain account for the right bullets for the.! A gran is a lot farther MM cartridge is……Take a guess….. wide. Ll have to look at SD shooting Here 's what is MOA and how to use in target.. The Civil War the U.S. adopted the.50-70 cartridge for the velocity lost in the 10-15 feet between bore. 7,000Th of a bullet, and you ’ ll get dozens of different answers with anything related. Because a longer bullet understanding bullet grain travel a lot of complicated math to figure out the ballistic coefficient and density! Will travel and sightline -138 V 17 Mach 2 15.5 gr is an angular of. And you can learn about ballistic you need a lot of technical details that go into.! Bullet leaves the rifle was sighted in for gun barrel currently offers two bullets 7mm.