I'd go 230gr +P Federal HST or 200gr DoubleTap Gold Dots. You might go with 230gr Gold Dots since the .45ACP is a low velocity cartridge to begin with, but with a 3.78" barrel, I'd go with a lighter weight if possible.
Kimber Ultra Carry II
Accurate Armory AAR-15 20" HBAR
Remington 870 Express super mag