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Barnes Reloading Manual #3 has plenty of information on
the 300 WSM.
I've tried RL-19 in mine: very accurate, but velocities with
165-168 gr. bullets were a little disappointing in my rifle.
70.0 gr. pushes 168 gr. Sierra HPs to 3028 fps. I needed
72.0 gr. to get 165 gr. Nosler Partitions to a comparable
velocity.
I've heard than RamShot Hunter and Big Game are good
powders for this cartridge. I may have to try them later
this Spring!
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