We have had much discussion about what type of shotgun ammo to use for home defense. I happened across this artical http://www.firearmstactical.com/briefs10.htm this morning. It is dated but should help to dispel some of the BS.
I agree with the article on the #1 buck, it has the best all around preformance for the 12 guage. I for one use 00buck only because I can get it regularly and cheap. Plus it is available in some great law enforcemnt rounds with controled wadding by federal(or it used to be before the ammo scare).
It is dated though and the sig argument following shows it. The 357sig almost took the market but I for one have found that the 124grain 9mm has jumped by leaps and bounds since then. Sig is a good round but it will not replace the 9mm any more than #1 buck will replace 00buck.