I shoot Winchester brass and like 42.4 grains of IMR 4895 with the 175's.
In Lake City cases (or equivalent) 42.0 grains with the 175's is awesome (and was the old M118LR load recipe when DuPont had the military contract).
Varget at 45 grains (Hodgdon's max) is a stiff load, but should work well in your rifle, and likely give 2600 fps, if you're interested in the most velocity you can get there...
In Lake City or Remington brass, folks are getting very good results with 43.0 grains of RL15.
Practical Long Range Rifle Courses...
Optimal Charge Weight handload consulting