>>64069163
To explain why this is wrong, I'll point out that the difference in accuracy between a trained and untrained shooter is on the order of several inches for a target at 7 yards. Being a better shot with regular bullets equates to an untrained shooter's bullets having the diameter of cannonballs, in so far as the ability to hit smaller targets goes.
Thus, the only thing that realistically matters in a self defense situation is how well trained the shooter is. The good shooter could have a .22lr, or a .45acp. They're shooting "cannonballs" either way.