IMR4064 is a good powder in the 30-06, but my favorite is H414. H414 gives me good velocity, consistent loads, producing good accuracy. The kicker is that it flows great out of my Lyman 55 powder measure.
Admittedly, I weight my loads on a scale. But H414 because of its outstanding flow characteristics has tempted me not to weight every load.
H414 also produces very accurate loads in my .243 Winchester.
IMR4064 is my favorite powder for the .300 Savage cartridge. I have not notice any flow problems when load it into that cartridge. I believe IMR4064 is slightly smaller then IMR4350 and should flow smoother.