These cookies will be stored in your browser only with your consent. As an example, a bullet can have a G7 BC of 0.279 above 3000 fps, but when averaged from 3000 fps to 1500 fps, the G7 BC is 0.273. Learn more . 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. Twist Rate's Impact on Ballistics. A quarter flying this way makes a lousy bullet, right? Sierra calls their new tipped GameKing bullet the GameChanger. The difference is eye opening. Some of the links on this page are affiliate links, meaning at no additional cost to you, Ammoland will earn a commission if you click through and make a purchase. Understanding basics means more game on the table, and more steel pings. The higher the number the less drag, and the more efficiently the bullet cuts through the air. When it comes to hunting or defensive use, you need the bullet to be in a certain velocity range to ensure the expansion of the projectile when it hits a target. 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. External/environmental variables, such as air pressure, temperature, altitude and humidity can change the density of the air. Quantserve sets the mc cookie to anonymously track user behaviour on the website. By adding an aerodynamic resin tip to the MatchKing, Sierra was able to reduce drag and produce a more favorable down-range ballistic coefficient. From front to back along the flight path, the quarter is only 0.069 inches long when its flying face first because thats the thickness of a quarter. Mach number is the velocity of the bullet divided by the speed of sound. Weve got a big wide object pummeling its way through the air towards the target. Introduced in 1965 with the .444 Marlin cartridge, the Model 444 was the most powerful lever action of its day. 270, 7mm,. Click below for a FREE LESSON! Introduced in 1997, the .260 Rem. This aerodynamic tip enhances the bullets ability to resist gravity and wind, and it ultimately reduces flight times. Given that there is an infinite number of bullet types, weights, and shapes, doing all the math for each would be an impossible task. Some big, heavy, and efficient bullets like the .50 BMG can have a ballistic coefficient greater than one, but that topic is for another day. Backfire LLC owns and operates this website. With an Accu-Fit stock and left hand adjustable bolt, this rifle is a perfect choice for anyone! Ive put together a convenient table of the highest BC bullets on the market. These cookies track visitors across websites and collect information to provide customized ads. Weve built dozens of ARs and well cover all the best AR-15 upgrades such as handguards, triggers, BCGs, gas blocks, and more. Most bullets exhibit a lowering BC as velocity slows. The Matchking has a coefficient of 0.417.
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