Is there anyone other than Hornandy,Lyman or Sage that makes gas check? I have some 30 cal gas checks that won't crimp on the shanks of my RCBS 130 sp cast bullet. I size them to .312 for my CZ527 in 7.62x39. I measured the shank and it's .285 IIRC. They will slip on but will not stay on even with the bullet sized. Now I thought I bought them from Sage but they don't look the same as they other 30 cal checks I bought from him. The name Gator pops up in the back of my mind is there a check maker by that name?