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A good magnifying glass will let you see if you are gently rolling the crimp or smashing the edge of the case mouth against the cannelure. My heavy crimps have a little bit of smash.
I can really tell from the fired case when I can see the cannelure marks imbedded on the inside of the case mouth.
Probably doesn't do much for brass life I'm afraid.
H110 is the only powder I use that needs that much crimp BTW.
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