I don't know if they changed the manufacturing process on the grand slams or not. I did also use a 180 grain grand slam in a .300 Win Mag, loaded to approximately .300 Holland & Holland velocities, and it seemed to work fine. However, that was some decades ago. Gave up the .300 Mag for a 6.5x55, which was much more pleasant, plus I didn't have to worry about loose dental fillings or a detached retina.
Maybe someone will have more current experience. I like your 90 grain GMX idea a lot.
|