first what i would do is take a look at your proof marks . are they BP marks or proofed for smokeless . but even then if proofed for smokeless , that smokeless was more like our low base today .
By as early as 1860 they were starting to produce different powders in Europe so every now and then you can run across something that doesn’t carry a BP proof yet has Damascus or varying types and qualities of laminated barrels
myself i use Bp in my Damascus laminated and fluid steel barreled ,SXS . However BP can also , under the right conditions , produce very high pressures so make sure you gun is in proper shape
In my muzzleloaders I don’t use smokeless of any type .
The exception tot hat is in my 1851 uberti with a conversion . In that I shoot 3.8 grains of A.S
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