I have a White Thunder .12 ga shotgun and its a hoot to shoot. So far just squirrels, but it will reach out there to 35 yds with 75 gr. T72Fg and 1 1/4oz #6 shot. I need to get busy and try out some turkey loads as well.
Only other muzzy shotgun I've owned was a TC System One .12 ga., not happy with that one and sold it.
The Knight TK2000 are good shotguns with a jug choke system. I was looking at them when this White showed up.
Good luck, if you enjoy muzzleloaders you will like the shotguns and the extra seasons that they offer.