I think I'm going to get a Smith 340PD for a backup gun and carry .357 rounds in it. The stats show that you're not gaining much velocity when carrying .357's over .38's in a 2" revolver, BUT.... If I have to use my backup gun, chances are I'm going to be rolling around fighting someone for control of my duty gun. That means I'll be in contact range. Even if the .357 doesn't fly out of the barrel much faster than a .38 round, it still has a lot more burning gas behind it and that gas has to go somewhere when you stick the barrel into someone's chest and pull the trigger.....
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