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Oh yeah, I forgot to mention.....
The crimp is more critical on a lead bullet than on a jacketed bullet for proper feeding into a semi-auto. Or, more accurately, too much crimp is more likely to adversly affect a lead bullet. The over-crimped lead bullet will feed too deep into the chamber causing pressure spikes and feeding issues.
The best way to check your crimp is to remove the barrel from your gun and drop a loaded round into the chamber. You should hear a distinct "plunk." Then try to push the round in further. If it goes in further, you crimp is not correct. After pushing the round in, you should be able to tilt the barrel up and the round should fall out on its own weight.
I found all this out the hard way [but without tearing anything up :D ]
Hope this helps.
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