I have concluded bullet weight accuracy is a barrel-by-barrel preference thing.
I doubt you can predict what weight a particular rifle will prefer.
I have a Savage 10 FP .308 with a 24-inch barrel that shoots most accurately with 150, 155 and 168 grain bullets.
It manages to do OK with 175s but won't tolerate heavier bullets than 175.
I have a Savage 10 FCP-K .308, also with a 24-inch barrel, that absolutely loves 175, 190, 195 and 200 grain bullets.
It tolerates 150s and 155s and manages to shoot 168s pretty well.
I have had three 6.5mm Creedmoor Savage bolt rifles (one was a 10T) and two shot heavier bullets like 142s and 147s best and the 10T shot the 123 and 130s best.
All there were OK with 140 grain bullets but the two that liked the heavier bullets shot the 140s better than the 10T.
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