I shoot a lot of 162 grain out of my 7 RUM, pretty much don't using anything else in it any more. 7828SC and Retumbo have been the two best powders for accuracy and top speeds. They also seem to burn a tad cooler, but that isn't really saying much when your torching of 90 or so grains a round. Definitely recommend you develop the loads using Fed 215 or Win Mag primers. The CCI 250 mags are not hot enough to reliably touch off those big powder loads, especially below -20.
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