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I carry Double Tap ball ammo in my P3AT. It feeds anything, but in .380 I think penetration is key. Expansion is iffy from a barrel that short, anyway.
Just for the record: I once personally asked Jeff Cooper himself, in a letter, if there were an advantage to using hollowpoints in a .45. I got a personal reply, in which he said the difference was not significant enough to bet your life on.
PS--just got word from the Texas govt. Website that my CHL was issued today. In a few days, I can start putting all this theory into practice.