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Welcome, by the way... Not many people walking around out there that will tell ya a 9mm felt any different going through the heart than a 10mm.
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This is agreed- But, you are assuming that optimum circumstances that will afford you a head/heart/CNS shot-
For the most part, even at combat range, tunnel vision sets in, and the "Fight-Or-Flight" instinct left over from when we were cavemen coordinates all of our motor skills to out promary appendages- Thus fine motor skill is severely diminished.
In such a scenario, precision shooting is dificult at best, so a gun with a decent level of stopping power is a must.
Any gun can "kill"- But the whole purpose of a gunfight is to "STOP" the action of your adversary immediatley- So, your chosen habilitment must have the requisite power to physicaly disorient the adversary- Not just "kill"
The US Armed forces learned this lesson against the Moro's in the Phillipenes when they were armed with only small caliber revolvers.
The 9MM is a good backup gun IMO, and I carry a HS2000 with +P+ Ranger ammo on occasion when the weather is hot, and I can't wear concealment clothing...
BUT, if all things are right, there is no reason to shirk the wonders of modern technology, and forego the 10MM- So supierior to every other round out there, that I don't understand why it isn't the most popular round in the US.