it was the ammo makers much later (in the 1930's I think) that demanded those two warnings be put on shotshell boxes: No nitro in Damascus barrels. And, as we transitioned to the 2 3/4" standard in shotshells, no shells longer than the chamber length. We now know (or have relearned, thanks to Sherman Bell's articles in DGJ) that longer shells in shorter chambers are not necessarily an issue.