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You need to seat deeper and heavy crimp into bullet's crimp groove to prevent bullets from pulling during firing. Speaking of bullets in cylinder not being fired pulling because of violent recoil.
This crimping action will slightly reduce brass dia allowing case to fit chamber.
Your brass is DIRTY - I would never destroy my dies by sizing brass that DIRTY.
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OldmanFCSA = "Oldman" at www.fcsa.org
FCSA Member, SCSA Member, NRA Member, & AMA Member
"Oldage & Treachery will overcome Youth & Skill"
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