Well, I hoped you would get additional input.
I don�t know how big your varmints are but the 75-grain Hornady Vmax will get 2,900 fps from 32.0 grains of Hodgdon Varget in the 1-14� twist 22� barrel. If you sight your rifle in at 150 yards you will be able to hold on most critters out to 200 yards. Your faster twist barrel may require altering this load slightly but I believe you will have little trouble equaling it.
When you get your rifle built I�ll try to get Greg Mushial from GMDR to join in the discussion. Greg had a fine slow twist 25-35. He was trying to build another but I have not heard from him in awhile. Between us we had gathered a fair amount of information about the older varmint rifles. It fun to talk about.
