[dep]

pipsqueak cartridge, alas. you want to make bigger holes in things. a good 12-gauge riot gun with rifle sights and loaded with 000 buck and rifled slugs alternately will be as effective over the ranges you're talking about as the mini, and will make much bigger holes.

dep

[Travis McGee]

pipsqueak cartridge

Spoken like a true chairborne ranger.

[oyez]

a good 12-gauge riot gun

One word -- Messy.

[lelio]

Take a gander at the articles on Olympic Arms about 223 penetration.
I was a 223 skeptic till reading that and hearing some real world examples of what happens after the bullet enters a body. Totally devasting!