OK, I'm not a hunter, but I'm curious..... with rifled slugs, you need a smoothbore barrel, and with sabot slugs, you need a rifled barrel? Is this right?
Generally speaking, that seems to be the unoffical rule. However, I've heard from folks who have gone both ways (sabot through smooth/rifled through rifled) who have said to have had no problems with those combinations.
I've easily shot ~10"X10" plates at 60-80 yds with rifled slugs through a smooth bore (modified choke) on my 1187 at plate shoots using Tru-Glo clip-on rifle sights. Was kneeling with the gun resting on a saw horse though. Damn thing gets hot pretty quick.