Enough Crimp?

[Sheepdog]

Originally Posted by Riverpigusmc

....my crimps run from .469-.471 for .45 acp. Your manual should give you parameters for other calibers. If it passes the plunk test, and if you can put the bullet against your bench and not move it by pushing with hand pressure, you're good. Check with calipers before and after the push test

What said. you do not want the bullets to "set back" I blew the mag out of a 1911 because of a setback. It caused a case rupture. Thank God for carbon fiber grips. I gat a face full of brass.

[DrHenley]

What Sheepdog said...

It looks to me like the bearing surface is below the case mouth. That means that the crimp does nothing for keeping the bullet from being set back. My jacketed loads have a tiny bit of bearing surface above the mouth to give the crimp something to bite into. You have to be careful though...too much bearing surface above the mouth can cause the ogive to hit the lands and prevent the gun from going into battery. I had to default on a match because I had some loads just slightly too long and they jammed the gun up tight.

[sdmc530]

I just measured and at the crimp I am at .469 and more so at .470. I can not get any setback at all, that bullet is not moving. I even tried to move a bullet with a bit of hand force and nothing doing. I am confident I am doing ok now that the measurements are adding up. I measured some Hornady factory stuff and they were all at .470-.471.......


you guys are so smart....