Bit late to the party, but I'll just leave these here. Granted both Grapeshot and 50 Cal. bullets have been reported to literally disconnect a humans top half from their bottom half. Also keep in mind that grapeshot is fired out of a cannon, and takes considerably longer to prepare another shot.

Grapeshot (little larger than fist sized) down to mustket ball. These were the typical "bullets" of the time.
http://images.ourontario.ca/Partners/llhm/LLHM071686.jpg (Unsupported image host)


These are many of the current day commonly used bullets. For (inaccurate) scale, the 50 cal bullet + casing would be slightly shorter than the length of your hand if placed at the base of your palm.