Precision 50 Beowulf (12.7x42)?

You can't use bmg projectiles unless you size them down .010, quite an operation. Beowulf uses .500 bullets like a 500 smith and wesson. 50 bmg uses .510 diameter bullets.

Take a look at 510 wsm or 500 whisper those have been done on precision rifles. I have a 510wsm still working on accuracy for subsonic loads
 
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