I have a 308 Norma Mag, and have not shot any factory ammo in it, ever! I resize virgin 300 Win Mag Brass, trim to length, load and fire away. I still believe it to be the best balanced 30 cal mag out there. I also own it's ballistic Twin, the 30-338 Mag. My Norma Mag is Very, Very accurate with the 180 & 200 Partitions using Reloder 22 or Norma MRP. Regards, Eagleye.