I have the Howa version and I did well with the first powder I tried, H322. I shot 50 & 55 NBT, and got lucky getting 60gn PT to shoot. The 55 NBT shot the best with the occasional group in one hole. If you use H322, this is a pretty fast powder so sneak up on it, I found sticky bolts below max and moving in .3 gn increments.
I can use 55gr B-tips or B-Kings interchangeably, but the 55grainer is my bullet of choice.
I use Viht N-140 powder & CCI BR primers with 1/2in results.
I'm not sure what your twist rate is ? If it's the standard 1:14 the 55's are about as heavy as you can go.
If it's faster, you might look at the 60gr B-tip.
In Both of my Remingtons i shoot half inch pretty easy!!! In my remington Vlss ,38 grains of H380 and a 50 grain ballistic tip or Hornady v-max, chronied these at 3700 fps out of my 26" tube. In my sps Varmint i shoot 34.8 grains of IMR 4064 at 3760fps. I have a pound of varget but have not tried it yet. I hear this powder is wonderful in the 22-250. :grin: