Ive only shot smooth bore style older slugs out of my mossberg 500 and verry few at that. But I would recomend the 500 because of the extended hunting season made possible by the Mossberg .50cal 500 barrel. Why just go slugin when you can extend your season in most parts. With 85 grains of Pyrodex and a 300 grain hornady sabot it shoots rather nice and doesnt really kick much at all. The muzzle loader 500 kicks less than the 12 ga slugs IMO.

Just my .02 on the matter
Peace
M5F