In other words, my M70 30-06 loves H4350 and 165 gr bullets. If I move to a 200 gr, does QL outline info (e.g., Barrel Time) about H4350's characteristics that would help narrow my search for a slower powder for this heavier bullet?

Real-world example: Moving up to the 200 AB and decided to try Hunter. Terrible groups; inconsistent. At 100 yards, I'd be getting 2"-3" groups from a rifle that consistently shoots < MOA. So, I'm guessing it's a no-go with Hunter. But, are there tips within QL from H4350 that would help direct me towards the best slower powder?

Murphy was a grunt.