4064 is good but it is a bit faster burning and more temp sensitive than Varget. IIRC it is more suitable for the lighter bullets in those rounds.
OTOH, I have found that those two cartridges are quite flexible and will shoot well with several powders.
PS these are the days where I frequently will find a 'new' powder that works well in my guns. Run into a 'deal' on an 8lb jug and make it work. Sometimes turns out to be as good or better than what I was using