2209 seems best powder with 140s in a .260, it works nicely in x55 also - but N560 will give higher speeds in x55. I stuck with 2209 because I don't trust non ADI powders for temp sensitivity + availability + they cost more than $50/500gm
Amax is much cheaper than the Swifts @R93........ and almost cheaper than the Interlocks actually. Tried to find some cheap 6.5 bullets for offhand shooting practice loads but turns out Amax is about as cheap as it gets