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Mike Rowe, I agree with 3DogMike. Your input is well appreciated. Please continue providing your insight.

3DogMike, From what I have read and been told by older shooters, one should reduce the black powder charge by the energy level of the added nitro powder. That is, if you use say 2 gr of SR-4759, you should reduce the black powder charge by 6 gr to keep the pressure the same.

Chris, Best success with your loading. BTW, I have used .511" hardcast bullets (both 350 & 440 gr) pushed by 4.75 dr of 2F in my 500 BPE. I use a dip measurer with loads measured in drams with 1/4 drams increments. I once weighed BP but found no difference between weighed and dipped charges.

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Precisely so, hence my reference to "sane & careful" when it comes to duplex loading.
Some printed sources as well as other forums have guys talking about huge duplex doses of SR4759, 5744, 4227, etc in their modern made Black Powder Cartridge Rifles. Not a good plan…..especially so in vintage or antique Black Powder rifles.
Chapter 7 in Graeme Wrights book (3rd Edition) touches upon some of the issues necessary for safe(er) duplex loading.

- Mike

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