cant comment on the 6.5 version but have 2 different 284's. Ones a 20in bbl and I'm getting ~2830 - 2850 with 160 - 162gn pills (TMK & AMAX) and a 22in bbl which gets me another 80 - 100 fps, running 162AMAX at 2930fps with RL17.
If that translates to your 6.5 284 then 22 - 23in bbl should be a good compromise
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