IMR-4350 with a hornady BT 130grain with Winchester once fire brass, is one of the best I have found for my ruger MKII 77
As far as exact, you will need to get a loading manual and work up a load for your rifle
My 2 best accuracy loads are 130 grain Sierra gamekings over 45.0 grains of Varget, and 130 grain Nosler Accubond over 54 grains of IMR 4350. Individual results will vary. Both go sub 1" on 3 shots.
My 270 loves either Sierra Game Kings or Nosler BTs in 130 gr with 55 gr of IMR4350. This load is accurate and has killed a lot of deer with DRT authority.
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