On a serious note I'm not sure why 357 Sig wasn't more popular than it was. (as an old 357 Mag fan) I know when I was at FLETC on recerts the Secret Service guys loved it. So I was surprised when their leadership went to 9mm and Glock ad they had been invested in SIG for almost 30 years.
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I have read, I think in Ayoob articles (don't quote me) that there were problems with premature wear. Also and this is just my opinion, those things are LOUD and with 9's being effective, easier to shoot, and cheaper, why go with .357?