45 reloading questiion

[918v]

Overcrimping causes misfires???

Good grief!

I need to go smoke a controlled substance.

 

[Elkins45]

Overcrimping causes misfires???

Good grief!

I suppose it's possible if they are crimped so tightly that the case mouth fails to engage the chamber, coupled with a bullet that has its engagement surface relatively far to the rear. Add the factor of a somewhat loose extractor, maybe a slightly thinner rim and possibly a slightly shorter case. All those tolerances MIGHT stack up in the wrong direction and cause the occasional misfire.

That's a lot of stuff that has to happen at the same time, which might explain why the misfires are only occasional.

 

[918v]

For what you describe to happen, the OP would have had to apply a .452" dismeter crimp. That is so far away from .470" that it would have been blatantly obvious.

 

[jcredman]

My thought was that if he is using a progressive press, was to make sure that the round was being charged with powder, sometimes something can get out of time. Just my two cents. (Which are worth less now than four years ago)