I found I hit pressure with Superformance with 178gr ELD before I got any decent speed. After doing a bit of reading Superformance seems to work better with lighter pills in 300 wsm. I'm running exact same setup rifle. I'd be going with Re26, seems to be the best for speed and pressures in the WSMs
I know a couple of other guys as well as myself running same Tikka 20" setup and they're shooting 62 gr RE17 with 178 gr and getting 2820-2860 fps. That's with Hornady book COAL same as above. All shoot 1/4-1/2 MOA with same load.
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