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Russell,
I've tried Retumbo, H870, H100, and A8700 in my Ultra Mags to include the .300 and 7mm. I found that those realy slow burners came up short in velocity and in accuracy in my rifles. I found better luck with RL25, RL22, IMR7828, H4350, and H4831. Those powders worked the best in my rifles. Hope this of some assistance to you also.
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hit em' hard and hit'em fast
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