Another reason is that for the average self defense situation the 10mm never really brought a lot more to the party than a 45acp. Yes it could send a 180gr bullet down range awfully fast but all of the gello results I've seen published showed pretty much the same expanded diameter and depth as the 45. In my opinion where the 10mm shines is as a back woods sidearm. With the right load the penetration outshines most other autoloaders. At least that's the only reason I'd buy one. Of course I'm not a leading authority so feel free to take my opinion with a grain of salt.
Things like car/barrier penetration I can't speak for.
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