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A very warm welcome to HuntChat, fordguy!
I've never loaded for the 7 RUM, so can't offer you any personal load advice. I'd check the websites for recent data.
That application calls for very slow powders, obviously. Hodgdon Retumbo or H4831SC, Alliant RL-25, IMR 7828, MagPro and similar powders all fill the bill. That beast eats a lot of fuel, so some of the cheap bulk cannon powders like Accurate 8700 would also be a good choice.
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