Haven't seen it mentioned here, but this is very worthwhile to bring up. Doug Giraud, of Giraud Tool Company now offers a Bullet comparator for the 50 BMG. I made my own a while back, but Doug's design is way ahead of mine, as his tool also is a chamber gauge. Giraud 50 BMG Case and Bullet Comparator Doug also makes the best case trimmer out there for the 50. When I got mine some years ago, it came set up for .223. I trimmed 500 .223, then I switched cutter head and shell holder and did 200 .50 BMG. All in under 2 hours!