The .50 Beowulf (12.7×42mmRB) is a 12mm caliber rifle cartridge developed by Bill Alexander of Alexander Arms for use in an AR-15 rifle. == Design and specifications == The cartridge utilizes a rebated rim, sized to match the rim of the 6.5mm Grendel round.
The .50 Beowulf (12.7×42mmRB) is a 12mm caliber rifle cartridge developed by Bill Alexander of Alexander Arms for use in an AR-15 rifle. == Design and specifications == The cartridge utilizes a rebated rim, sized to match the rim of the 6.5mm Grendel round.
Source: Wikipedia ".50 Beowulf" · CC BY-SA 4.0
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