My best load for the 140-grain bullet (both Sierra PSPBT and Nosler Partition) in the 7mm Rem Mag. is 71.5 grains of OLDSURPLUS H4831. MV is 3350 FPS from a 26" barrel. This load consistently groups in 0.5" - 0.6" at 100 yards. Newer H4831 may be faster, so to use this load, it must be approached from at least 5% below (68 grains), and worked up to in half-grain increments. I use mine in a Ruger 1B which has a standard-length throat-no freebore.