galt11 Posted November 6, 2006 Share Posted November 6, 2006 I have been loading 45 ACP for a while now but need a second opinion on something. recently I noticed after a couple of jams, that rounds being fed into the chamber were being pushed into the case a little more than before they were fed. As a result I tightened down the crimp die on my Dillon a little. now however I am seeing the bullet is being compressed a little where the bullet is in the case and possibly grows a little (mushrooms) above where the brass meets the bullet. When I mic'd the bullet I notice a thousandth difference smaller. Is this normal or ok? Thanks Adam Link to comment Share on other sites More sharing options...
Canuck-IL Posted November 6, 2006 Share Posted November 6, 2006 Check your sizing die...crimp doesn't prevent bullet set back, sizing creates the neck tension. In fact, overcrimping can promote set back as it can cause the brass to bulge just below the neck...crimp to .469-471 on 45acp. /Bryan Link to comment Share on other sites More sharing options...
galt11 Posted November 6, 2006 Author Share Posted November 6, 2006 The largest measurement I could get was .470 Link to comment Share on other sites More sharing options...
wide45 Posted November 6, 2006 Share Posted November 6, 2006 Plated bullets? Link to comment Share on other sites More sharing options...
HSMITH Posted November 7, 2006 Share Posted November 7, 2006 .470" is on the tight side by a couple thousandths. I want to see .472-.473" on mine, and if it is a little over it isn't a big deal as long as the gun runs. I won't go under .472" for any reason. Like the Canuck said, resistance to setback is entirely done in the sizing die. Nothing you do after sizing will help prevent setback. Link to comment Share on other sites More sharing options...
mike_pinto Posted November 7, 2006 Share Posted November 7, 2006 I am thinking the same thing wide45 is, I think.. If you are using cast, you may need to clean out the seating die as it may have some lead/lube gunked up.. Link to comment Share on other sites More sharing options...
JD45 Posted November 7, 2006 Share Posted November 7, 2006 Doggone HSMITH, I keep fiddling with my dies to make sure they are well under .470". I read that advice here or somewhere. Maybe I'll try backing off some. Link to comment Share on other sites More sharing options...
Canuck-IL Posted November 7, 2006 Share Posted November 7, 2006 (edited) Different game but same idea...everybody shooting Bullseye that I know of crimps to at least 471 and 469 is probably the norm...mind you, that's all for lead whether, swaged or hardcast. /Bryan Edited November 7, 2006 by Canuck-IL Link to comment Share on other sites More sharing options...
galt11 Posted November 7, 2006 Author Share Posted November 7, 2006 Sorry I should have mentioned I was using 185 gr. Montana Gold JHP. Adam The setback is not happening during the loading process. It happens when the round is driven into the chmber of the gun. If I understand things correctly, the other dies shouldn't affect the bullet. If you mean that the sizing die is opening the body of the brass too much below the bullet and them not closing it back down, I guess that might be it. Am still a little lost. Adam Link to comment Share on other sites More sharing options...
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