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In the several 7mmRM I've owned or loaded for, I've not gotten the best performance out of 139s. 150 and, particularly, 154 Hornadys have given great results with IMR 7828 and H4831. There is a lot of variance in chambers, so consult a loading manual. I'd get a box of 150 WW or REM at Wally or Academy and measure your cases for a good baseline.
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