I could not get anything over 70 in a boattail design to stablize(did not try many)--I tried some 85 Sierra HP's & 80 NBT's--they were great in my 10 twist--did not work well at all in the 14--
Never tried any flat base bullets--they may have worked in the 80gr range--

The 55 NBT's and 58 V-max shot so well I never tried anyting else --other than just a few rounds that were loaded for my 10 twist.