you a link to reset your password. Just an old curious guy. Thats way too complicated, so lets use an illustration. Did this help sort out just what ballistic coefficient is? Interestingly, the Trophy Bonded Tip was the only bullet that penetrated less (23.5 inches) at 400 yards than at 50 yards, testifying to its consistent expansion characteristics. Introducing the latest products from the worldwide leader in ammunition. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. The Remington Model Seven is ready, willing and able to handle just about any task. In each pair, the first bullet has a flat base, and the second has a boat tail. BC is a number that can be used as an input for ballistic solvers to predict trajectories. Very short and wide. These days, most bullet data is published with BC numbers for the traditional G1 drag model, but given the explosion of long-range shooting interest, more are also publishing numbers for the G7 model which is more accurate for sleek and slender long range bullets. Learn the 3 most popular shooting stances & more. So, someone said, Hey! The G1 drag model is based off of a stereotypical spitzer bullet (pointed nose) with a flat base. Very helpful! This website uses cookies and third party services. Ballistic coefficient, and to an extent drag itself, is what is going to determine some of the most important factors in shooting. Gain a deep knowledge of ballistic science and access our improved ballistic calculator. As an example, the Hornady 6.5mm ELD Match bullet has a BC of 0.646 for the G1 drag model but a BC of 0.326 for the G7 drag model. Spitzer rounds with a flat base have a much higher BC than Round nose bullets. You can also find him on Facebook, Twitter, Instagram and Pinterest. Now, lets launch them both at 2,750 feet per second from a Sierra Bullet Blaster 7000 rifle and see what happens. Without getting into the math, I'll define the ballistic coefficient in words as: The ability of the bullet to maintain velocity, in comparison to a ' standard projectile '. The boat tail helps, but not nearly as much as the point on the front of the bullet. Weight. Find a Retailer. With the AccuBond Long Range, Nosler made some wise enhancements to make the bullet shoot flatter and hit harder at distance, while still delivering that legendary Nosler Partition-like lethality. A bullets efficiency is measured by its ballistic coefficient (BC). As examples of very streamlined bullets, note the BC of these Speer match type bullets. Great scores on paper targets do not equal the best shots when hunting -- unless you're using the same bullets for both target practice & hunting. This makes the bullet less sensitive to seating depth and makes load development much easier. Does the actual BC matter? While the ELD-Match is made for competition, the ELD-X is built for killing. The bullet manufacturers that choose to advertise BCs taken at high speed only, may appear to compare better to Bergers, but the apparent advantage is misleading, and will not result in accurate long range predictions. The higher the number, the less drag the projectile will experience. This is done so you have an accurate number that represents the bullets performance over long range. It get that G1 is an average under 500 yds and G7 is an average over 500 yds up to sonic velocity when everything falls apart. This is an Alexa Analytics cookie that is used to track user behavior. Nice article, well explained except for the fact that you assumed people would know that they were both zeroed at 100 yards. At the peak of the market-hunting era, waterfowlers We interviewed fourth-generation master flintlock rifle maker John From forcing cones to action bars, here's a Sign up for the Field & Stream newsletter and get the latest intelligence straight to your inbox. They need to be able to factor in how far the wind will move their round, bullet drop, and velocity at different ranges and it all ties back to the BC of their particular load. Ballistic Coefficient (BC) values can, and usually do change in value with changes in velocity. The definition according to Wikipedia is, "the ballistic coefficient (BC) of a body is a measure of its ability to overcome air resistance in flight.". Bullets for hunting, however, might benefit from not having an aerodynamic shape. One more thing. Another thing to keep in mind when comparing BCs is related to caliber. We appreciate your patience and continued support! Hornady now publishes "200 yard" Mach 2.25 (2,512 fps @ ICAO Standard Atmosphere**) G1 and G7 Ballistic Coefficient (BC) numbers for all A-Tip, ELD-X, and ELD Match bullets. Ballistic Coefficient (BC) values at Mach 2.25 (2512 fps @ ICAO Standard Atmosphere) should be used when comparing to other published BC values within the industry. Heck, few whitetails, antelope, mule deer and even average black bears measure much more than 12 inches broadside through the vitals. Simply put, sectional density is the ratio of weight to the diameter of the bullet. . 270, 7mm,. Introduced in 1965 with the .444 Marlin cartridge, the Model 444 was the most powerful lever action of its day. You also have the option to opt-out of these cookies. Also notice the big difference in BC between the round nose bullet (.216) and the spire point bullet (.357). I assume the muzzle energy for the 2 bullets has a typo. Why Is Knowing Your Rounds BC Important? As opposed to same in a flat base bullet. But opting out of some of these cookies may affect your browsing experience. In summary, comparing BCs is a natural thing to do for shooters interested in long range performance. It delivers smaller BCs but is consistent throughout the velocity of the round, giving you a much more accurate representation of BC. Korean combat vet playing around with the 300 BLK in a mini 14 and the 7.62 in a mini 30. Mach 2.0 (2,233 fps @ ICAO Standard Atmosphere) and Mach 1.75 (1,954 fps @ ICAO Standard Atmosphere) BC values are also available. 250 gr. And they come in two varieties: Those designed for hunting, and those designed for target shooting. Not so long ago a Barrett or Cheytac was needed at a high price for shots out to a mile+. My next preferences is Sierra, Swift and Hornady. The slower the bullet the less range youll have. Part of that consistency is having the same powder charge, same projectile, same rifle, and, of course, the same BC. On the other hand, the G1 BC above 3000 fps can be 0.590, while the average from 3000 fps to 1500 fps is only 0.533. He is a well-known entrepreneur, having started many successful online brands, and lives in St George, Utah. The base is a boat-tail shape. RELATED: 10 Best Long-Range Hunting Cartridges. Unfortunately its not as simple as just comparing the single numbers. In the world of ballistic coefficients, a bigger number means that a bullet flies more efficiently. Almost any bullet can be made to expand at long range, but the thin jackets and soft cores that promote such expansion don't support bullet integrity when impact distances are close and velocities extremely high. .243" 100 grain Round Nose (BC .216): -1.5" @ muzzle, +4.8" @ 100 yards, +6" @ 200 yards, 0 at 300 yards, -15.9" @ 400 yards, -46" @ 500 yards. Simply a .308 case necked down to hold 6.5mm bullets, it was a popular wildcat before being adopted by Remington. 2023 Outdoor Sportsman Group. The BC of a bullet is a ratio calculated by a mathematical model based off of its density and its particular shape. A slower barrel twist of 1:10 is generally adequate to stabilize bullets weighing up to 100 grains, while the accuracy of heavier, higher ballistic coefficient bullets is improved by a 1:7 or 1:8 twist. After spending some time with this database you will most likely find the bullet that best meets your needs. .375 H&H Magnum (L), .338 Winchester Magnum (R) Public Domain. One must take barrel twist into account depending on the type of 243 Win cartridge that is fired. Hunters who choose a 195 Berger EOL hunting bullet compared to a 140gr Nosler Accubond-even if both bullets are shot at 2,800fps- would see 6 less drop and 8 less wind drift at 500 yards. It was nice to see it all brought together in one. It will also work with other .257 caliber rifles, as long as they are fitted to barrels with a very fast twist. //-->, Copyright GunData.org 2015 | Koenig Media, LLC | Links | Sitemap | Advertise. Get 12 Issues a year of the country's best firearms writing. Don't be confused the next time you hear "ballistic coefficient" tossed around by long-range shooters. Ballistic Coefficient (BC) is basically a measure of how streamlined a bullet is; that is, how well it cuts through the air. By clicking Accept All, you consent to the use of ALL the cookies. If a bowling ball was used for the drag model, the BC would be very high because the bullet would be much more efficient as it flew through the air. The extremely poor SD of the .224" bullet lowers its BC, even though its shape is similar to the others. The G7 is more representative of the current state of rifle rounds. If more than one bullet shoots equally well, then choose the one with the higher BC. Making those long range shots past a 1000+ nice! Thanks! With the right BC you can make a . tried some sierra boattail in 300 win. Their Hybrid Target design incorporates two different shapes within its nose. However, the science and scientists that got us to this point goes back all the way to the 16th century. If you chase this rabbit down the hole it will lead you around the internet and sometimes confuse you, anger you, and then all of a sudden youll have a breakthrough. google_ad_client = "ca-pub-8417283882784443"; Three words: Use Berger Bullets! I just returned from the range today and found out some interesting stuff about b.c. All BCs (G1 and G7) advertised by Berger Bullets are averaged from 3000 fps to 1500 fps. The slower the bullet the less range youll have. These bullets have extremely high BCs. The following photographs of our test subjects show an unfired bullet, a sectioned bullet and a bullet recovered from gel at 400 yards and a bullet recovered from gel at 50 yards. Let's compare the practical ballistics of a traditional flatbase bullet with a modern high-ballistic coefficient bullet when both are zeroed at 200 yards and fired in standard sea-level conditions. For example, if you like to shoot old cap and ball revolvers you are familiar with standard round balls as projectiles. G1 (flat base with two caliber (blunt) nose ogive), G5 (short 7.5 boat-tail, 6.19 calibers long tangent ogive), G6 (flat base, six calibers long secant ogive), G7 (long 7.5 boat-tail, ten calibers tangent ogive), G8 (flat base, ten calibers long secant ogive). Ballistics Basics: Bullet Efficiency And Ballistic Coefficients, Gun Review: Nighthawk Border Special 1911, Classic Guns: The Ithaca Model 37 Shotgun. Unfortunately, the .270's relatively slow 1:10 rifling twist, as spec'd in SAAMI's reg book, won't stabilize the stretched-out, heavy, streamlined bullets that offer extremely high ballistic coefficients. Niccolo Tartaglia was the first to notice that a shot trajectory was continuously curved. When comparing BCs of different bullets, it is important to use an apples-to-apples approach. Calculates the ballistic trajectory of a bullet fired from a rifle, handgun or other firearm. Apr 3, 2014. Mag. Variation in BC with Velocity (G1, G7, etc), Manufacturing Effects on: BC, Accuracy, and Precision. When doing pre-purchase research either on the web or at the store, the increased performance of the ELD Match and ELD-X bullets wasnt always realized in a head-to-head BC comparison. "These new bullets beat everything out there, even at the highest levels of competition, by 20%." - Alan Warner, Warner Tool Company. The same weight bullets from other manufacturers will have different BC's, because they are slightly different shapes. Mag. Ballistic Performance of Rifle Bullets, 3rd Edition, 6.5mm (.264 Caliber) 144 grain Long Range Hybrid Target. Starting all three bullets at a muzzle velocity of 3100 fps from a scoped 6mm rifle zeroed at 300 yards, the trajectories are as follows. It is accurate, has an excellent ballistic coefficient, and provides moderate recoil. Its that simple. e dont want slow bullets. Think about it this way: An arrow is more aerodynamically efficient than a tennis ball. If you are looking to hit a target beyond 600 yards, your really need to learn and understand your rounds BC. Please let me know how it can be improved upon. This cookie, set by Cloudflare, is used to support Cloudflare Bot Management. So what is the standard projectile? In actuality, the smaller caliber, lighter-weight bullet actually has a BC thats 28% higher than the larger caliber, heavier bullet. Sign up to receive new product announcements, special offers, and the annual product catalog. The more efficient a bullet is, the better it will maintain its speed. A variation of the _gat cookie set by Google Analytics and Google Tag Manager to allow website owners to track visitor behaviour and measure site performance. Until now. Back in the day, guys with lots of time on their hands fired boatloads of projectiles to figure out how they behaved in flight. The definition according to Wikipedia is, the ballistic coefficient (BC) of a body is a measure of its ability to overcome air resistance in flight.. Ive put together a convenient table of the highest BC bullets on the market. Most bullets exhibit a lowering BC as velocity slows. Much of your article is reinforcement of what I have gathered previously in several different articles. Correct? G1 Ballistic Coefficient - this is the older system of measuring BC and is more suitable for flat based bullets, although many bullet manufacturers use this coefficient for boat tail bullets as well, as it is more commonly found. When using 90-grain bullets with a very high ballistic coefficient at .563 G1 BC, the 224 Valkyrie is a legitimate three-quarter-mile cartridge. Even their ammo is great. Its a jacketed bullet with a tiny hollow-point, non-expanding design. It's often been compared to the 6.5 Creedmoor. J. Scott Rupp takes a first look at the Springfield M1A Loaded rifle chambered in the popular 6.5 Creedmoor. The fastest, most streamlined bullet may go right thru the animal you're shooting at, so you might need to use a heavier bullet that doesn't move as fast, but expands a lot more & won't go all the way thru. AccuBond Long Range bullets will hold up to extreme, high-velocity impacts at close range, and still deliver expansion and penetration at crazy long distances. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. document.write(new Date().getFullYear()) Copyright Hornady, Privacy Policy | CCPA Request | Accessibility Policy | Terms of Use, Designed and developed by IdeaBank Marketing, drag coefficient based trajectory calculations, Product Warning & Recall Notice - Item #8263, Product Warning & Recall Notice - Item #90226, Product Warning and Recall Notice - Item #9249, Product Warning & Recall Notice - Item #81153, Product Warning & Recall Notice - Item #82730. It's like the humpty-dumpty or weeble of the .308 bullet world. | Quantserve sets the mc cookie to anonymously track user behaviour on the website. A bullet with a high ballistic coefficient is slippery and less subject to drag (slowing down) as it continues on its merry way. @Tio, The thought part is the most important and that costs nothing. But the more streamlined bullets have a higher ballistic coefficient. Ballistic Coefficient values at Mach 1.75 (1954 fps @ ICAO Standard Atmosphere), should be used when calculating trajectories for shooting beyond 600 yds. Although a faster bullet isnt necessarily more accurate, its affected less by gravity and wind. There are lots of ways to describe what ballistic coefficient is. Learn all the important stuff about handgunswith none of the attitude. The cookie is used to store the user consent for the cookies in the category "Other. Its great for lever-action rifles and hunting. Lets design a standard bullet and do all the math for that one. Not really. That boils down to more complex factors like shape, length, and weight distribution. Also, using the G1 model gives bigger ballistic coefficients, which look better in terms of marketing. The ability to know, in advance, how much a bullet will drop or drift in the wind at a certain distance allows you, the shooter, to make scope holdover adjustments that will increase the odds of you hitting your target. Maybe I cant slam dunk like Jordan but I can still enjoy the NBA right? It wasn't hard to choose a bullet diameter and weight and a cartridge through which to test it: America is still a .30 caliber nation; 180-grain projectiles typically offer excellent sectional density and ballistic efficiency; and the .300 Win. Learn more . First Focal Plane vs. Second Focal Plane Scopes Explained: Which is Best? For example, the sectional density of a 175 grain .308 caliber bullet is: 175/7000/ (.308^2) = 0.264 (the bullet weight is divided by 7000 to . Mathematically, it is the ratio of a bullet's sectional density to its coefficient of form. As a result, bullet manufacturers have never made high-BC bullets in .277 diameter (the actual size of .270 Win. Slow-burning, temperature-stable propellants like H4831SC and . In conjunction with the hollow nose cavity and a lead-alloy core, the tip optimizes penetration and tissue destruction over a wide range of distances. The nail flying point forward has a very high sectional density because its long and skinny. Select what level shooter you are! The difference is eye opening. The drag created by the bullet depends on a number of factors, including the projectiles weight and design. He has managed multiple gun ranges, and has hunted around the world. *Velocity at International Civil Aviation Organization (ICAO) Standard Atmosphere (Sea Level, 59 degrees F, 29.92 inHg, 0% Humidity). BC is measurement of how efficiently a bullet is able to cut through air . Access features of the Reloading Handbook on your mobile device with the Reloading App. ; ), BC = Section Density divided by Form Factor. But unlike standard factory fare, the Cutting Edge bullets are intended to start . An example would be a .459 dia cast bullet with a 440BC at 560grains. I'm looking at building my own ballistic computer and it's been difficult to find the actual equations for not only bc but for everything else for long distance shooting. I count myself among them, and I think the market for high ballistic coefficient bullets will likely explode with the release of the new Hornady 7mm PRC. This is an extreme example but illustrates that the different shape of a projectile will affect your ballistic coefficient. USA -(Ammoland.com)-Heres why obscure [and some say boring] bullet ballistic concepts like ballistic coefficient and sectional density are essential if you want to hit targets regularly when shooting at long-ranges. Since those early days, other smart folks have developed different predictive models on bullet flight based on a variety of bullet types. Ballistic coefficient (the measurement of how easily the bullet passes through air) is a critical part of the equation, as well. Heres why. The 7mm caliber offers some of the highest BC bullets on the market. This means you have the option to read your magazine on most popular phones and tablets. 308 Ballistics Chart & Coefficient. The main benefit of the 55-grain bullet is its ballistic coefficient. If a Mach number is unavailable, velocity can be used if the BCs are corrected to Standard Atmosphere which is fairly typical practice within the industry. Good write-up Tom. Necessary cookies are absolutely essential for the website to function properly. Ballistic Coefficient values at Mach 2.0 and 1.75 offer comparisons to other manufacturers that publish multiple BCs based on velocity. . For this example, I am going to use a Hornady 30-06 Springfield load with a 125 grain SST projectile, With that said, the number the manufacturer gives you is a rough estimate. The Ballistic Coefficient of Rifle Bullets. Our first offering in the Blackjack Bullets lineup is the 25 Caliber 131 grain ACE Match bullet with an outstanding 0.330 G7 Ballistic Coefficient (1000 yd Average BC) tested on the Oehler 88 System. You do not pay This means that the speed and energy will vary from cartridge manufacturer to manufacturer. Therefore, these variables are mostly a concern when youre trying to determine the change in your bullets speed from the last time(s) you went shooting.

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