I do shoot mine a lot by most folks standards, but I do it with my own reloads. My data basically comes from the Reloading Pages of M.D. Smith which you can google up. He lists loads specifically for top-breaks, and I have even substituted lighter bullets for some of these in the interest of keeping pressures down. (and POI)

I have shot factory shells, and currently have some, but they "feel" quite a bit hotter than my reloads.

I keep a very close watch on the condition and tightness of my guns and haven't detected any change ---yet. If I do, well then ??? jim