.243" 100 grain Spire Point (BC .357): -1.5" @ muzzle, +3.8" @ 100 yards, +4.7" @ 200 yards, 0 @ 300 yards, -11.1" @ 400 yards, -30.5" @ 500 yards. Both increase the BC of a bullet. The extent of how much a BC will change depends on each unique bullet shape. Its a jacketed bullet with a tiny hollow-point, non-expanding design. Most bullets exhibit a lowering BC as velocity slows. As opposed to same in a flat base bullet. Correct? I suspect this would lower the BC..but any idea how much? In words, the Ballistic Coefficient of a bullet is it's sectional density divided by its form factor. Their Hybrid Target design incorporates two different shapes within its nose. Give a Gift Kimber's Hunter Pro Desolve Blak takes the firm's more affordable mountain rifle to new heights. Although a faster bullet isnt necessarily more accurate, its affected less by gravity and wind. On such heavy-bodied game animals, which are challenging to hunt and rarely offer a perfect broadside presentation, I'm a believer in using premium, heavy-for-caliber bullets. It details drop, time, energy, velocity, range, and does so in . 1 Single-Shot Rifle: Tips to Improve Its Accuracy, Wilson Combat Paul Howe Tactical 6.5 Creedmoor: Full Review of the Versatility Champ, .45-70 vs .450 Bushmaster Cartridge Clash, 10 Great .22 Mag Bolt-Action Rifles Right Now, Sweet Scents of Gun Solvents and Oils: 12 Perfumes for Firearms, .375 H&H Mag. Put another way, its the ratio of the bullets sectional density to its coefficient of form. Using B.C. Succinct explanations for someone just getting started. Unfortunately its not as simple as just comparing the single numbers. The longer they have to act on your projectile, the more of an effect theyll have. If they penetrate only 12 or 14 inches (inhibited by that same massive frontal diameter that's causing such dramatic tissue destruction), that's usually adequate. 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 '. For 2020, Federal will be offering a new line of ammunition called Terminal Ascent, which uses a bonded bullet with a solid-copper rear shank to penetrate deep on close targets, and a polymer tip to initiate expansion at velocities 200 fps slower than comparable designs. With that said, the number the manufacturer gives you is a rough estimate. anything extra and your BC is mostly used by rifle shooters. If it asks for a G7 number, use the 0.326 figure. Twist Rate's Impact on Ballistics. This cookie is set by GDPR Cookie Consent plugin. There is a pretty big difference in trajectory between the round nose bullet and the two pointed bullets, making it obvious why it is folly to choose a round nose bullet for long range shooting with a high velocity rifle like a 6mm Remington or .243 Winchester. The G1 drag model is based off of a stereotypical spitzer bullet (pointed nose) with a flat base. The _ga cookie, installed by Google Analytics, calculates visitor, session and campaign data and also keeps track of site usage for the site's analytics report. This means that the speed and energy will vary from cartridge manufacturer to manufacturer. ; ), BC = Section Density divided by Form Factor. Rest assured, there will be performance differences between every two bullet designs of the same weight and different shape, just not as dramatic. Set by the GDPR Cookie Consent plugin, this cookie is used to record the user consent for the cookies in the "Advertisement" category . Also, using the G1 model gives bigger ballistic coefficients, which look better in terms of marketing. The base is a boat-tail shape. They will also sometimes require a faster twist rate. The ACE Match is only available in one caliber, and you might be wondering why this bullet is even mentioned. Spitzer rounds with a flat base have a much higher BC than Round nose bullets. If more than one bullet shoots equally well, then choose the one with the higher BC. The test_cookie is set by doubleclick.net and is used to determine if the user's browser supports cookies. A bullet's efficiency is measured by its ballistic coefficient (BC). A bullet's BC will differ depending on whether the G1 or G7 drag model is used. Weve got a dedicated section for the AR-15 here. YouTube sets this cookie via embedded youtube-videos and registers anonymous statistical data. The Barnes Accu-Groove technology also means less fouling and less bore cleaning. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. .375 H&H Magnum (L), .338 Winchester Magnum (R) Public Domain. Given that there is an infinite number of bullet types, weights, and shapes, doing all the math for each would be an impossible task. Newly Published base of comparison. Mach 2.0 (2,233 fps @ ICAO Standard Atmosphere) and Mach 1.75 (1,954 fps @ ICAO Standard Atmosphere) BC values are also available. Just $1 per month , Without the right bullets, you wont get very far. Imagine launching a quarter at a target, but we somehow get it to fly face first, so the top flat side with Georges head is leading the way. My takeaway is this data is really of more interest to long range (over 300 yards?) Available Calibers: 6.5mm, 7mm, .308, and .338. Installed by Google Analytics, _gid cookie stores information on how visitors use a website, while also creating an analytics report of the website's performance. These hypothetical examples show us two things: 1) A more aerodynamically efficient bullet wont slow down as much on its way to the target, and 2) efficiency doesnt matter as much when the air density is low (thin air). Ballistic coefficient (the measurement of how easily the bullet passes through air) is a critical part of the equation, as well. Its a lead-tipped, jacketed bullet with a flat-point tip and a flat base. My best "take away" was the reinforcement of consistency in long range shooting. There are actually several different standard projectiles with different measurements and they each measure drag in a different way. A bullets density is a ratio of a bullets mass and its cross-sectional area. Published Dec 17, 2019 5:47 PM EST, We may earn revenue from the products available on this page and participate in affiliate programs. A high BC bullet can maintain velocity better than a low BC bullet under the same conditions. guns & Variation in BC with Velocity (G1, G7, etc), Manufacturing Effects on: BC, Accuracy, and Precision. Don't be confused the next time you hear "ballistic coefficient" tossed around by long-range shooters. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. Analytical cookies are used to understand how visitors interact with the website. In summary, comparing BCs is a natural thing to do for shooters interested in long range performance. Type your email address and well send What did this exactly mean? It doesnt pass through the air, or the animal, easily. 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. 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. Sign up to receive new product announcements, special offers, and the annual product catalog. The round design lowers the BC and creates more drag compared to a modern Spitzer round. The main benefit of the 55-grain bullet is its ballistic coefficient. 338cal. But the more streamlined bullets have a higher ballistic coefficient. That doesn't seem to be an overstatement, based on the Ballistic Coefficients (BC) WTC has published on this new line of bullets. In short, a high ballistic coefficient is indicative of a rounds ability to resist drag. You might see different BC numbers for bullets at different velocity ranges. It also demands purpose-built bullets. RifleShooter Magazine editor Scott Rupp breaks down all the features of the Mossberg Patriot Predator rifle chambered in 6.5 PRC. The 55-grain bullet provides a good balance between the light 40-grain and the heavy 77-grain bullets. The 7mm caliber offers some of the highest BC bullets on the market. I just returned from the range today and found out some interesting stuff about b.c. The flat point Pro-Hunter has a ballistic coefficient of 0.185. Get 12 Issues a year of the country's best firearms writing. With an Accu-Fit stock and left hand adjustable bolt, this rifle is a perfect choice for anyone! During this time of overwhelming demand, our team is doing everything possible to produce more bullets and ammo than ever before. That means that the BC numbers for a G1 and G7 drag model are different. Before you get into all the calculations, answer this question: what do you want the bullet to do when it hits what you're shooting at? Still the most popular .338 magnum in the world, the .338 Win. along with muzzle velocity and input for wind speed and direction allows the user to determine what to . The cookie is set by crwdcntrl.net to collect statistical data such as the number of visits, average time spent on site, and what pages have been loaded, for targeted advertising. Mag., and .300 WSM.and as a component for handloaders. Part of that consistency is having the same powder charge, same projectile, same rifle, and, of course, the same BC. One is a 150-grain Sierra Pro-Hunter. Introduced in 1965 with the .444 Marlin cartridge, the Model 444 was the most powerful lever action of its day. Hmmm Looking at the chart, says bullet drop @ 100 yards: 0.0. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". Available Calibers: .224, 6mm, 6.5mm, .277, 7mm, .308, .338, and .375. For the last several years, Hornady has developed some of the best long-range bullets on the market. This is done so you have an accurate number that represents the bullets performance over long range. The .30-06 Springfield was better than the .30-30 because it spit the same .308-inch bullets 400 to 500 fps (feet per second) faster. The more efficient a bullet is, the better it will maintain its speed. google_ad_width = 728;