1137 vs 12L14 for muzzleloader barrels

[Comfortably_Numb]

Can anybody please explain why if 12L14 steel is strong enough to contain black powder pressure, then why do barrel manufactures make smoothbore barrel so thick and heavy? If our ancestors could use forge welded and Damascus smoothbore barrels that have lasted for over 100 years, what is the worry about using modern steel?

It's people that don't know any better. I have oredere custom fowling gun barrels that are feyy thin except for the breech, easily as thin as originals.