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Is the rating 'automatic'? That is, is it something like "any shotgun barrel manufactured prior to 1940 is automatically not rated for steel shot", or words to that effect? Or is there more to it than that?
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I think that it's just as you stated - that barrels that preceeded the advent of steel shot have thinner walls and cannot be used with non-toxic shot without damaging the barrel. I have an older (1950's era) Belgian that clearly shows damage internally from non-toxic shot.