Put one together with the federal sabots that hold
.Barnes slug that they sell, and other .500 diameter bullets like
used in muzzle loaders and .500 S&W. Now
regular 50 cal bmg bullets are .510, but some have front
section .500. Called the borerider. I took one of these
and cut off back and ended up with 470gr .500
bullet to put in sabot.It is in pic,Ed