Some people then as now continue to use black powder in shotguns, 45-70 rifles, Colt SAA and all sorts of guns. They like the smoke and nostalgia I suppose.
I was referring to Parker patterning loads for the changeover to nitro around 1900. If you look at enough hang tags, you'll see exclusive use of nitro starting at least as late as 1900.
A 1922 damascus barrel really means that it and fluid steel barrels passed the same proof tests that Parker used at the time, averaging 15,500 psi for a 12 ga. That of course doesn't mean the barrels will rupture immediately above that. Again, see the TPS tables, which I have posted here many times. Parker provided suggested load tables expressed in ounces of shot and drams of powder, drams for black and drams equivalent for bulk smokeless. A person could shoot black out of a Vulcan and smokeless from damascus, whatever his fancy.
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