You would be better off killing them than shooting them with non lethals, because if they are still alive, they could turn around and sue you in this wacked up world. Well, at least in America that's the case. But yeah, you shoot a criminal, and then end up where they all are...
I guess sabot slugs would be very useless, I figured they work just fine out of a smooth bore, but yeah I guess it would be a waste of money, I have shot them out of mine and I figured they were okay, but with rifled I'm sure they rock. Wax slugs are still my favorite, just fun to make.
Oddly enough, it just occurred to me, I drive a Ford Ranger, and my shotgun's a Winchester Ranger. Lol!
Yeah, stick with the 26, it will suit all your needs.