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Rifle Cartridge Calibers Compared: 6.8x51mm, .30-06 Springfield, 6.5 Creedmoor, .300 Blackout & .338 Lapua Magnum Rifle cartridge selection affects recoil, range, rifle size, ammunition cost, optic choice, and the role a firearm is best suited for. The image compares several important rifle cartridges, including 6.8x51mm / .277 Fury, .30-06 Springfield, 6.5 Creedmoor, .300 Blackout, and .338 Lapua Magnum. Each cartridge serves a different purpose, from modern service rifle development to hun …