Ok I was reading a post that was comparing 9mm 357, 38. The jist was that the 357 was better because essentially they are the same size bullet, the 357 has greater muzzle velocity so it causes more damage. My question is which more important the size of the bullet or the speed in which it travels? Does a slow heavy round say 230gr fmj .45cal that travels at 750-850 fps going to do less or more damage than say a 68gr .45 cal that travels at 1800 fps? Which is the most important, size, weight, or speed?