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As to duplex loads, my best for the .50/70 was 10gr. of IMR3031 and 60gr. black, 2F I think.
In the past, I have used SR5759 in duplex loads, but that one with IMR3031 worked like a charm in an original model 68 Sharps
barrel and shot more cleanly than the lighter loads using faster burning powder. Standard primers.
I read about using IMR3031 in a handloader magazine, or perhaps it was mentioned in BP Ctg. magazine my bro gets.

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Interesting, Daryl! I've used the faster powders with excellent results but have never heard or read of using IMR-3031. It's such a versatile powder I'm not surprised to read what you wrote. The SR-4759 load I mentioned shoots cleaner than some smokeless loads I have.

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