96.7gr of Retumbo with 165gr Interbond.

I own three .3OO Rums and find 89 grains of H4831 to be best in one, 88 in another, and 94 of H1000 in another, all under a 180 grain bullet. I have found really slow powders to have inconsistent muzzle velocities; it shows up at long range.

this cartridge is exceedingly accurate, btw.