The biggest issue loading for the 9mm is bullet size, then alloy. many 9mm run on the large bore size & you want to be at least 0.001" over bore size. I have more than one 9mm, so run 0.357" in everything with good results. Enough flare to not scrape the coating is also a good thing for accuracy.
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NRA Cert. Inst. IDPA CSO
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