[MD_Willington_1976]

How about the .50 Beowulf upper...Been reading up on it...looks like fun.

[umgud]

Go to gunblast.com. Jeff Quinn has roadtested the 50 Beowulf AR version and a BFR custom revolver version.

[Atlas Sneezed]

How about the .50 Beowulf upper...Been reading up on it...looks like fun.

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Indeed, but although they share a projectile diameter, the 50 Beowolf is a straight-walled cartridge with a blunt projectile, which lods through an AR-15 lower (OAL = .223, single stack to fit), while the 50 BMG is a high-velocity bottle-necked rifle cartridge that shoots a mile.

50 Beowolf 400gr @ 1800 FPS = 2878 FPE @ muzzle
50 BMG 700gr @ 2800 FPS = 12189 FPE

Beeg Deeference! (Though the 50 Beowolf would be nifty slowed down to subsonic and supressed.)