The .450 Bushmaster is descended from the “Thumper” concept popularized by Jeff Cooper. Cooper was not a fan of the 5.56x45mm NATO round and envisioned a need for a large-bore cartridge in a semi-auto rifle that would provide one-shot kills on big game animals at 250 yards. Bushmaster...
Bushmaster was the first gun manufacturer to produce firearms in .450 Bushmaster, Tromix was the original firearms manufacturer for the .458 SOCOM, and Alexander Arms developed the first rifles in .50 Beowulf. All of those companies still make very good quality firearms chambered in their respectiv...