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Ended up going 20 inch barrel, 64 grains Reloader 17 gave 2950 fps average with the 168 Amax, will try some 178 eld x in the next few days.

What charge is your 2209 load Smiddy?

Cheers Smiddy,

Was there much difference in performance between the 18 and the 20?

Anyone running a Tikka 18 inch suppressed 300 wsm
Interested to hear any info on load data average velocity, suitable powders for 168 amax, and what average loss of velocity per inch of barrel...