Russ, I don't think its the chamber configuration issue, as at least I regularly shoot Feds and other modern cartridges from a top action hammer Parker with black powder chambers. My concern would be barrel strength, as I don't know and have not seen figures about barrel strength for them. I think all or most of them were laminated steel barrels and I don't know how strong those are.
I assume, but don't know, that a person could shoot 5,000 to 6,000 psi loads from a laminated barrel without concern, as that has to be below the original barrel cartridge loads. Of course look at wall thickness. I regularly shoot 8,000 psi or more loads from a top action hammer with Damascus barrels, but then it has .040 or more thickness.
Best, Bruce
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