Thats a first for me to hear that, I have a .357Sig barrel for my XDm and I have used lots of Federal in them, Mostly the Match ones because I had boughten a case of them. Then I got a case of the standard sp's.Now a couple cases of CCI,since I was testing. I don't know what to say about yours piercing,because I haven't had that. Sharper firing pin ?
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