Elmer Keith, in his book Sixguns, mentions that he knew several Civil War veterans, and learned about percussion pistols from them. The consensus was that the round balls were a better "manstopper" load than the conicals. The conicals gave better penetration, as when shooting cattle or hogs for meat, but little shock effect, being pointed. The soft, pure lead round balls, being more blunt in shape, AND having the nose flattened out when being loaded, tended to have a greater effect on men. He went on to say that those that had used, and seen used, both the 38 spl and 36 cal percussion Colts, considered the 36 percussion Colts a better manstopper. Remember that the standard 38 spl load was a 158 gr round nose. A load renowned for poor performance on about anything.