There was a recent episode on the Mil Channel with the bald guy where he shot one of the semi-auto 50's...Barrett or AI, I don't recall which.

BTW, it's my understanding that the Calif 50 BMG crowd has worked around the 50BMG ban by swaging bullets and cases down to .495

Jonesy,
A friend used to fly -38's in WW2 with 8 .50s on the nose. Nearly no paralax! Gil knows him too. He was looking a bit frail last year, hope he's well.