ORIGINAL: joshtribe
Ok, maybe we aren't as crazy as I thought.
Yesterday we fired several lead slugs out of the bird gun with surprising accuracy. Using only the bead on the end of the barrel, my brother hit a two-inch circle on a target 40 yards away. Any uncomfortablness I had about hunting deer with this gun has since vanished.
As you appear to have discovered, there's nothing wrong with using slugs in a 20-ga. As long as you use the Foster or Brenneke type slugs, they will pass through a full choke with no problem. IMO, the Brenneke slugs kill a lot better than the Foster type, so use them if they'll shoot accurately in your gun.