24.0- 24.5 gr. of RE15 and a Sierra 77 MK or Hornady 75 BTHP has been a go to load for NRA highpower service rifle shooters for many years. Out of a 20" service rifle barrel they usually run around 2750 fps. It is a bit temperature sensitive, in my testing figure around 1.2 fps of velocity change per degree of temp change.