No handloader can duplicate the factory ammo velocities that use a proprietary powder... just like no handloader can duplicate those same proprietary "High Energy" loads available for the 30-06, 308, et al.
If anyone thinks two grains more H4350 than a 30-06 to push a 180 at 2,825 from the 300 RCM is a Magnum, I've got a bridge in Brooklyn for them.
A 30-06 will get to 2,800+ loaded to the same pressure as the RCM with 58.0 H4350.
Two grains and less than 25 fps between them... good grief, IT'S A MAGNUM!
“Perfection is Achieved Not When There Is Nothing More to Add, But When There Is Nothing Left to Take Away” Antoine de Saint-Exupery
