I think that at one time Winchester removed the bolting from an M21 and proceeded to fire multiple loads through the gun, successfully. I wouldn't swear to this but I can't imagine that I would cook that up on my own! Maybe some one here knows?

To Steve Nash' point. A LeFevre Nitro or any 311 variant with their rib extension/inclined slot lock up will stand up well to just about any reasonable abuse one might offer. Guns made in somewhat recent times, built to a price point.

Chief