I've held off long enough now. #4 shot is not buck shot (#0 or #00) nor is it dove shot (#7 or #8). It is for hunting Turkey, Ducks, and Geese (Large Fowls).
Anyway, Also if your concerned about putting holes in walls or through your walls into other people’s houses there are "Freedom Rounds" such as those used on airplanes by the air marshals. These rounds will wreck your life, but not your walls. Supossedly you can stand on the other side of a single sheet of dry wall and the round won't go through it; but if it hits organic material it jacks it up.
http://www.extremeshockusa.com/cgist...48&idp=0&his=0
This remarkable round is the terrorists worst nightmare. Under most circumstances, the AFR (Air Freedom Round) will not penetrate the skin of conventional aircraft, causing a decompression. It is also designed to not penetrate the aluminum backs of most airline seats, reducing potential collateral damage in the event of a shootout at 30,000 feet. Unlike rounds made of polymers that can generate lethal ricochet, the Extreme Shock AFR round will turn to harmless powder if it misses its intended target and hits a hard surface. It is the only round in the world with this level of performance and safety. This is also possibly the world's safest home defense round, as in most circumstances, it will fragment in standard 1 half-inch sheet rock wallboard. This bullet runs at plus-P type pressures, and should be used only in firearms of good construction and good working order.