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I think powder selection has a great effect on accuracy.I have found while reloading for my Ultra Mags that switching powders gave me my best results after selecting the type of bullet I wanted to shoot. In the caser of my .300 RUM I choose to shoot the 180gr Swift Scirocco and tried RL22, RL 25, H870, H4831, IMR 4831,and Magnum from Ram Shot none of these powders provided what I wanted. I received a tip and tried IMR 7828 and never looked back. I loaded up 3 different charge wieghts and all grouped very good but one load worked the best and I got these results by switching to IMR 7828.
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hit em' hard and hit'em fast
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