.450 Bushmaster

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 M16s and AR-15s, using modified magazines and upper receiver assemblies.

.450 Bushmaster
.450 Bushmaster (left), .223 Remington (right)
TypeRifle
Place of originUnited States
Production history
DesignerLeMAG Firearms LLC
Designed2007
ManufacturerBushmaster
Hornady
Produced2009–present
Specifications
Parent case.284 Winchester
Case typeRebated, 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 length1.700 in (43.2 mm)
Overall length2.260 in (57.4 mm)
Case capacity59.5 gr H2O (3.86 cm3)
Maximum pressure (SAAMI)38,500 psi (265 MPa)
Ballistic performance
Bullet mass/type Velocity Energy
250 gr (16 g) SST 2,214 ft/s (675 m/s) 2,722 ft⋅lbf (3,691 J)
260 gr (17 g) AccuTip 2,180 ft/s (660 m/s) 2,744 ft⋅lbf (3,720 J)
250 gr (16 g) FTX Hornady BLACK 2,200 ft/s (670 m/s) 2,686 ft⋅lbf (3,642 J)
Test barrel length: 20 in (508 mm)
Source(s): Lynx Defense
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