My 260 Sako 75 22" shot 140 Amax, 140 Berger, and 142 SMK, just fine, all well under MOA w/9" twist. Other '9' twisted guns would have to be shot to see, but MY rifle spun them just fine.
FWIW, alot of elk dropped w/130 C/C bullets via 270 Win.
A 129 Hornady 6.5mm is VERY close to a 130/277. They hold up well on impact - in fact about as much as a 125 Partition.
140s will give you more of what already works.
The above is not 'Pretend'....
