I tested some more loads today in my 16.5" 300Mag.The load was 64grs. of IMR4064 and the 150gr XLC BT velocity was 2870fps
Groups ran 2" I'll play with the OAL to see if it will shot better.So far the 300Mag likes 180gr Speer SBT's pushed to 2680fps those group 1/2" to just a hair over.
I'm loven it!!!! NO Matter what anyone else thinks.
