Well, my superposed has digested several hundred rounds of steel with no ill effects.
I know what Browning says, and this is not a recomendation for others to shoot steel out of thier superposed, I'm just saying I haven't had a problem. I conceed that several hundred rounds is not enough to prove anyting. Maybe the next round will cause a bulge or worse.
"Don't shoot steel" is a blanket statement by Browning to cover all situations. The question to shoot, or not shoot, steel out of a gun may not always have a hard yes or no answer. What size steel shot? What chokes do you have? What vintage and brand of ammo? Wad technology has improved over the years.
I'm not endorsing a superposed for steel shot, but factory recommendations are not gospel. Browning (and everyone else) also say not to do your own gunsmithing....how many of you still do? I'm just saying......