I agree, same for my 22-250AI, I had best luck with H4350 and believe it or not Varget did extremely well.4350/RL 19 burn rate powders @ mid 30gr charge.
With a 30"-32"Bbl 4831 burn rates powders are too slow.
I use N550 and a 75gr A-max. This combo yields excellent velocity but can be finicky with outside temp. If I do my part and adjust the charge weight accordingly ES below 20 is the norm.