I like the fluting & build.
Ive built 11 6x45s so far on Savage actions and AR15 frames.
The best builds are on the Savage actions which are much more accurate and no real constrictions on COL like the AR15s.
I did them all with 1/9" twists to run 55-95g bullets.
Powders Ive run or use for 55-95g would be exTerminator, aa2015, H335, benchmark, 10x.
I can get mid 2800s with the 85g SGKHP bullet and 2588 with the 95g NHBT. I don't run heavier bullets in the 6x45s.
IMO the 85g sgkgp, 90 & 95g NBHT in front of H335 are the tops for antlope/deer to 400 yards, then energy really drops off.