I have the same gun that I rescued from a pawn shop. It and another H&R 410 were both in the rack together. 175.00 cash sent both of them out the door with me. I actually like the 158 better than the sb1, more so for the reasons. 1 its a nice looking gun, 2 it has a longer barrel, yet weighs less. 3 its smoother in operation than the other one.
as far as shooting, I have shot probably 300 rounds through mine over the past couple of years, and its taken more than its fair share of grouse, rabbits and squirrels.I it eats 2.5 and 3 inch shells no problem. Mine seems to like the #5 shot, but 6 do work in a pinch.
As pointed out, 410 shells can be a pain to find, and I usually buy several boxes at one time when they get in stock, esp if I find the #5 shells. after last years hunting season, walmart had a few boxes of my beloved #5 shells on sale for 14.00 a box
and I bought them all, I have more in shells than in either of my two guns