Seems that you could make a 308 or 7.62 version of the 50 Beowulf by using a 300 ultramag reamer to the right depth or any of the ultramag reamers up to 375. Maybe a 338-50 Beowulf would be better but a barrel swap on a 7.62x39 or 50 Beowulf could be interesting. Bolt thrust might limit this but even if it was for a subsonic 375 or 338 it could make for an interesting round if you already had a 50 Beowulf.
Any thoughts?
Hmmmmmm... 375-50 Beo Hmmmmmm....
A 375-50 Beo would be just a fatter 6.5 Grendel by about .1"