RE: imr 4064,257 roberts/110 accubonds
I had the best luck with IMR4350 in the Roberts case. If you can't find a load using 4064, trying trading some w/ a friend. If it's in sealed containers, you should be able to sell some 4064 and buy something else.
If you lived around here, I would trade you. I like 4064 in my .338-06 and my .375 H&H.