.50 Beowulf

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.50 Beowulf
5.56 mm compared to .50 Beowulf cartridges.
Type	Rifle
Place of origin	United States
Production history
Designed	2001
Produced	2001–present
Specifications
Parent case	.50 Action Express
Case type	Rebated, straight
Bullet diameter	.500 in (12.7 mm)
Neck diameter	.525 in (13.3 mm)
Base diameter	.535 in (13.6 mm)
Rim diameter	.445 in (11.3 mm)
Case length	1.65 in (42 mm)
Overall length	2.125 in (54.0 mm)
Primer type	Large pistol magnum
Maximum pressure	33,000 psi (230 MPa)
Ballistic performance
Bullet mass/type Velocity Energy 300 gr (19 g) Speer Gold Dot JHP Alexander Arms 1,870 ft/s (570 m/s) 2,330 ft⋅lbf (3,160 J) 325 gr (21 g) Speer JHP Alexander Arms 1,800 ft/s (550 m/s) 2,338 ft⋅lbf (3,170 J) 335 gr (22 g) Rainer Plated FP Alexander Arms 1,771 ft/s (540 m/s) 2,333 ft⋅lbf (3,163 J) 335 gr (22 g) Rainier Plated HP Alexander Arms 1,900 ft/s (580 m/s) 2,678 ft⋅lbf (3,631 J) 400 gr (26 g) Hawk JFP Alexander Arms 1,800 ft/s (550 m/s) 2,878 ft⋅lbf (3,902 J)
Test barrel length: 16 inches Source(s): Beowulf Ballistics

The .50 Beowulf (12.7x42mmRB) is a 12mm caliber rifle cartridge developed by Bill Alexander of Alexander Arms for use in an AR-15 rifle.^[1]