I have a S&W MP40, and a standard 1911 .45. I bought the Smith because I never owned a hi-cap handgun. Not sure of the MP in .45 cal, but I really like the .40. Doesn't seem to be quite as accurate as the 1911, but then I havn't shot 3 or 4 thousand rds.thru it yet. I honestly believe that the .40 will do anything that the .45 can, loaded with the right ammo. I prefer the 180HP, in the .40. And plastic milk jugs blow up real good with them. While in the .45, 200gr.HP work nice. Which ever you choose, I do believe you'll like it. We keep trying peace, it usually doesn't work!! Remember (12/7/41)(9/11/01) gypsyman