I own and shoot several old damascus barreled guns English and American made.I use low pressure shells in all my old guns regardless of barrel material,no point abusing old guns for no reason.When I was a boy I often shot my uncles old hammer double using Winchester hi velocity 2 3\4" shells from the local Western Auto store.50 years later I still have that gun.It is a Crescent arms twist barrel gun that was sold by Montgomery Ward.It has 2 1\2" chambers and is right now tight and on face after many years of (unknowing) abuse.I reckon those guns are stronger than a lot of folks think!

N.R.A lifer