Originally Posted by
Bigslug
While it's not going to be needed for recoil-pulling, as in revolvers, 45_C may be hinting at setback due to feed dynamics of certain guns (?). I don't know what the extended Tokarev family of pistols and subguns does for impact (nose vs. case shoulder) on the feed ramp, but it's worth remembering that our Red friends didn't move much beyond RNFMJ with the concept. I'd coat the nose of a round with dry-erase marker, chamber it, and then make a study of where the hits are. If they're all ogive impacts, I wouldn't consider a crimp groove any further. If the edge of your meplat is getting some rollover, I'd at least think about one.
I did some noobie experimenting a few years ago with the fat meplat 452423 .45 Auto Rim bullet through various 1911's. While I got it to feed, there was a definite hitchy-kerchunky feel in how the gun ran that suggested it wasn't happy at the prospect, and the noses were absolutely getting deformed going up the ramps. Your bullet profile is nowhere near that extreme, but it's a good cautionary tale about letting the guns - which in your case are military and designed without consideration for variety - tell you what they will accept.