Re: US869 in the 264 win mag
In my opinion US869 would be far to slow for you to reach top performance levels unless your using the old 155 gr SMK or the heavier Wildcat Bullets. For any 6.5mm bullets up to 142 gr class, there are much better options including Retumbo and H-1000 and the powders you already are using.
If you want a ball powder, Ramshot Magnum would be a much more appropriate burn rate for conventional bullet weights in the 264 Win Mag.
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