Used to use IMR4064 and 52 gn Sierras for varmints or 760 and 60 gn Nosler Solid Base for pronghorn but now there are much better choices.
My favorite for 50 to 60 gn bullets is Reloader 17. Can't beat the accuracy or velocity.
Second favorites, for 50 to 55 gn bullets, are 2000 MR and H4350. 2000 MR has the advantage of working chunk-free through a powder measure.
The loads listed below are Maximum in my rifles and you would be nuts to use them as starting loads in yours.
50 gn Nosler BT - 42.8 gn 2000 MR or 44.6 gn R17- 210 primers, Norma cases
52 Sierra - 38.4 gn 2000 MR or 44.0 gn R17 - 210 primers, Norma cases
55 gn Nosler BT - 41 gn 2000 MR or 42.8 gn R17 - 210 primers, Norma cases
60 Nosler PT - 41.5 gn R17 or 46.0 gn H4831 - 215 primers, Win Cases
