Bison Armory 22-Inch Heavy Stainless Target. The cartridge also performs particularly well in barrels down to as short as 10-inches. Weapon Evolution I shot about a dozen deer and hogs with it at various angles to see how it performed. . The barrel length of the 6 8 SPC caliber will influence the ballistics performance and hence your shooting style. Plus 16 is also the shortest length legally allowed in most states. 20-inch barrels arent exactly popular options for close quarter fighting. Out of a sixteen inch barrel a 68 SPC round with a bullet weight of a hundred and ten grains can fire at a rate of two thousand and five hundred feet per second. The cartridge was designed around the M4 length barrels. The longer the barrel the less velocity will become. The 223 which the 556 is based off is designed for 20-inch barrels. Most importantly though the cartridge was specifically designed around a 90 grain Sie...
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