Hi 3 gun
I think caliber is an important consideration, I'm just not sure it is the most important consideration. I feel real comfortable packing my 625-4 on my hip, it is one of a long line of .45 revolvers I have carried, and I have faith in gun. That said, I really can not say that .45ACP/Auto Rim is anymore successful than .40 or 9MM or 38+P.
I know that dressed up in my Sunday go to meeting clothes, my p-7M8 packs a lot better and does not print like my big N-frame's.
I still stick with my first rule of a gunfight, "have a gun, within reason most any gun will do!"
Good talking with ya, 3 gun, Good Luck & Be Safe
First, with the most, WINS!
Regards, Scattergun Bob