For varmints, I use 50 grain V-Max or 52 gr. BTHP match, either Speer or Hornady. I use 28 grains of IMR 4320 for the V-Max, and 28 grains of Win. 748 with the 52 gr. BTHP's. However, don't start them at this. The primers show some pressure signs at this level.