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The 450 Bushmaster began as a Jeff Cooper concept and Tim LeGendre’s 45 Professional cartridge. The 45 Professional cartridge is based on the 284 Winchester case, shortened to 1.771″ and tapered to accept a 0.452″ bullet. Working with Hornady for development, Bushmaster licensed the use of the Professional design, shortened to 1.700″ and with its…

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