I have been told most modern rifled slugs can be shot from a full choke without doing any damage. However I would not try it, and I doubt it would be very accurate.

If you have a 10 ga frame, get a 12 ga heavy barrel fitted to it and shoot 12 gauge slugs out of it. Basically it will be an Ultra slug hunter when you do that. The 12 ga Ultras are built on the 10 ga frame. Call H&R/NEF to see if you can do it. Probably cost you less than 150 bucks, the barrel is only 80 bucks. You have to send your gun in to get the barrel fitted though I think. Maybe a gun smith can do it for you? I don't know how H&R operates as far as that goes.

Paul