I am loading some 200gr LSWC and have been informed that I should have a crimp giving me .469" at the top.
What crimp should I achive for a 230 gr FMJ?
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September 16, 2011, 11:26 AM
The same if that's all that's needed to remove the flare. Don't be stuck with thinking that you have to achieve a specific dimension for the crimp. All you need to do (all you SHOULD do) is remove the flare for the particular bullet you are loading. The dimension can range from .469 min. to .472, maybe more. Dropping a test round in your barrel will tell you when you've reached your maximum crimp dimension.
September 16, 2011, 11:38 AM
Depends on the chamber size of your pistol barrel and the diameter of the bullet.
For .452" diameter lead bullets, M&P45 will pass the loaded round drop test in the barrel and reliably feed/chamber taper crimp up to .473". For tighter chambered Sig 1911, up to .471"-.472" taper crimp will pass the drop test and reliably feed/chamber.
Many shooters use .470" taper crimp, but I am a bit OCD and want my case neck to seal tighter against the chamber during firing for more consistent chamber pressures (Some will argue this point, but that's what I do for pursuing accuracy).
For .451" diameter bullets, I use .470" taper crimp.
September 16, 2011, 11:42 AM
In my limited experience, the crimp matters in the reliability of the round to consistently feed. I load only 200gr, and in my kimbers, if my crimp is much over .471 I get 3-point-jams. My loads are typically .4695-.470 and I do not have any 3-pt-jams. If all you do is static target practice, probably not a problem. But I also try and compete in IDPA and USPA, so my loads need to be reliable.