In my 270 WSM I am getting 3200 fps with 140s Inter & Accubonds with 69 grains of either R26 or R25 both powders shot well, might be worth a look in the 6.5 WSM. But you are already on track with Magnum, probably wouldn't gain much velocity with R26.
"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
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