I would wait on Superperformance until last to experiment with. I have been using it in 6.5 Creed and .260 Rem AI test loads with fair luck. I would try H4831sc, starting at 40 grains with a 120 grain bullet. What I would like to see is a 25 Remington (.260 necked down) AI, that would work better in a AR10 than the 25 WSSM did in an AR15 with the same ballistics.
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