IMHO, a 9MM over penetrates and may even pass thru. Radnor likes his .45, I assume for its stopping power. It is, however, harder to carry and conceal. My little S&W .38+P only has 5 shots, but with the .38HP, I am not too worried about what is on the other side, it is small, light, and easy to conceal. Radnor has 17-34+ shots, to my 5. But if I miss w/5, I assume I am dead anyhow. The bad guys are usually less than 10 yds away, but they think I am a feeble old man......1/2 right(OLD)