Do a search on H&R or Ultra Slug and see what comes up. They are sort of popular. I own a H&R Ultra Slug Deluxe and like it. I won't comment on accuracy yet because I have not found a load it really likes yet. I will say that 3 inches at 100 yards is pretty easy. 1 inch is probably possible if you take the time to find the right load. Mine is very accurate at 50-75 yards no matter I what I shoot out of it though.

Mine even shoots rifled slugs pretty well. It really depends on your particular rifle though.

Paul