I actually have two of the 16 ga guns myself, one is a model 158 and the other is one of the discontinued sb1 models. I absolutely love the 16 ga guns, almost as much as my .410s. I just can't seem to miss with them, for some reason they just seem more effective than the 12 ga. maybe, its my fascination with that guage verses the 12 ga. but I would take it over the 12 any day. As far as shells go, Walmart did carry them for a while, and Farm and Fleet does have them as I just bought 2 boxes in Lacrosse, wi. the other day. there are not as cheap as 12 or 20 ga shells but with a single shot, its not like your going to burn through em quick
nice thing about em is they don't fly off the shelves like the rest of the ammo recently