The HP GK is a magnum bullet designed for higher velocities than its SP counterpart. Other than being harder (and better suited for heavy game), both bullets may be loaded with the same powder charge, are equally accurate and shoot to the same POI. I currently use them in my .30-06 ( SP on Roedeer and HP for Wild Boar) without having to resight. I also shoot the 2 in my .300 Win Mag's.
