Depending upon where you are hunting, do not discount buckshot. Pattern Master choke tubes work wonders. I use OO in three inch magnum in my smooth bore deer barrel in my 870. This combo is deadly out to 50 yards. Probably, even works at a greater distance, but I limit my range to 50 yards with buckshot. Great for thickets. No reason a Thompson would not work just as well. Of course, it is going to thump you pretty good, too.