When I load IMR4064 I throw a light charge and finish the charge with a powder trickle. Since I want consistent match type ammunition I just take the extra step.
Another powder I like is Accurate 2495 which in my rifles has given very good results. Other powders I like are VIHT N-135 and VIHT N-140. However my AR is a 24" barrel with a 1:12 twist so I have no clue how those powders will perform in your rifle. This year as soon as it warms up a little I want to get back to working with the Accurate 2495 using in the 39 to 42 grain range.
This thread would likely fare much better in the hand loading/reloading section.
Ron