I finally got around to shooting the unique octagon barrelled original Peabody Sporter chambered for .45-50 Peabody Sporting.  
Here are the two types of bullet loaded in brass from BACo, formed from .348 Win, and from Bell 43 Spanish Basic, together with an original paper patched UMC cartridge.
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The lighter bullet is a 315gr from a fellow Peabody aficionado, the heavier is the original 405gr HB arsenal bullet for the .45-70
Smokeless loads for both bullets was 23gr SR4759, tuft of dacron, and a Fed 215 primer. light crimp.  5 blackpowder loads were prepared with 50 gr 1F Schuetzen, light compression, firm crimp.
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All groups shot at 100 yards, from rest.
Results:
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Blackpowder loads fired mainly to compare pressure signs, as well as to check point of impact compared to the smokeless loads
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Pressure comparison iindicates noticeably greater pressure with the 4579 loads.  Notice greater metal flow and significant flattening of primer metal on the smokeless loads (left and right) compared to the blackpowder (center).While in no way too strong for the action, the unusual tab firing pin gives somewhat less support than I desire, so I'll probably back off 10-15%, or try Unique or Blue Dot on the next go-round.
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