.450 Bushmaster
| .450 Bushmaster | ||||||||||||||||
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.450 Bushmaster (left), .223 Remington (right) | ||||||||||||||||
| Type | Rifle | |||||||||||||||
| Place of origin | United States | |||||||||||||||
| Production history | ||||||||||||||||
| Designer | LeMAG Firearms LLC | |||||||||||||||
| Designed | 2007 | |||||||||||||||
| Manufacturer | Bushmaster Hornady | |||||||||||||||
| Produced | 2009–present | |||||||||||||||
| Specifications | ||||||||||||||||
| Parent case | .284 Winchester | |||||||||||||||
| Case type | Rebated, straight | |||||||||||||||
| Bullet diameter | .4520 in (11.48 mm) | |||||||||||||||
| Land diameter | .4420 in (11.23 mm) | |||||||||||||||
| Neck diameter | .4800 in (12.19 mm) | |||||||||||||||
| Base diameter | .5000 in (12.70 mm) | |||||||||||||||
| Rim diameter | .4730 in (12.01 mm) | |||||||||||||||
| Rim thickness | .0540 in (1.37 mm) | |||||||||||||||
| Case length | 1.700 in (43.2 mm) | |||||||||||||||
| Overall length | 2.260 in (57.4 mm) | |||||||||||||||
| Case capacity | 59.5 gr H2O (3.86 cm3) | |||||||||||||||
| Maximum pressure (SAAMI) | 38,500 psi (265 MPa) | |||||||||||||||
| Ballistic performance | ||||||||||||||||
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| Test barrel length: 20 in (508 mm) Source: Lynx Defense | ||||||||||||||||
The .450 Bushmaster (11.48x43mmRB) is a rifle cartridge developed by Tim LeGendre of LeMag Firearms, and licensed to Bushmaster Firearms International. The .450 Bushmaster is designed to be used in standard M16, M4, and AR-15 rifle lower receivers, using modified magazines and upper receiver assemblies.