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TheGreatWazoo

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  1. I know this is an old post, but the problem is with the sizer die being too big. I had the same problem with RCBS dies for 9mm years ago but only with jacketed bullets, not lead bullets. Went to Dillon dies for my 550 and all was solved. The bullet must be held by the CASE, not the CRIMP. You need a slight crimp on an auto caliber to get rid of the case mouth belling. If you try to overcrimp, it will deform the bullet jacket but the case will spring back slightly when it exits the die leaving you where you started-with a bullet loose inside the case. Dillon and Redding dies work well for .380 and 9mm. Oh, and for MRVvrroomm - good luck with your .358 bullets going down a .354 bore. You are going to create excessive pressure. I am even surprised your cartridges would chamber - there usually isn't that much slop in the chamber dimensions. Poor choice for a home defense load.
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