Plenty of 444 owners watching your results with interest - keep it up - I need to do some reloading - 265 hdy fp with 53 grains of ADI 2206H powder is what i used last. Powder reported to have a burn rate similar to IMR 4895. Last loads with this slower powder were also accurate (as was 45 grains of ADI 2207 which is similar to H4198). A long time between range visits for me.
That last group with the 265 are exceptional, when I reloaded the 265 FP, used 47 grains of H4198 but that was elk hunting.
Check on the shooters forum on Beartooth bullets, lots of 444 reloading info.