Keep playing with the load, go up to a max load in your rifle, and use a thick cup primer only such as a 7 1/2, CCI BR-4, or CCI41.
My favorite bullet with this powder was the sierra 50g lead tip blitz, unreal accuracy, seat the bullet to touch the lands and .005 off.
I shot a 1000 of the Sierra 45g spt in this powder also, really loved that bullets accuracy and speed.