Let's just use 12g 2 3/4" as an example. If your barrels are good, whether they are Damascus, twist or fluid steel, there is no reason why you can't shoot 1 oz at 1200 FPS out of the gun. No reason at all except for possibly the shooter being "recoil sensitive". Most problems arise when shot charges get bumped to 1 1/8-1 1/4 and your velocity increases above that 1220 mark. Then you may cause damage to the old wood long before you see any problems with your barrels or action. In my 40 years of shooting and 20 years in the industry, I have only seen two shotguns blow up. One was due to a flaw in the steel, the other was contributed to a bore obstruction while using known low-pressure shells. I have seen many handguns blow up though. Most from high pressure from low powder charges.
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