Mark,
I'm running 45.5 grains of H4350 with a 120NBT for a smidge over 3000fps. this is out of a 24 inch tube. Very accurate and flat enough for the 100% of shots I take under 300 yards.
40 grains of Varget also works well but found the H4350 to be better in terms of accuracy for similar speeds. Could never get the velocities out of W760 or RL19 using the same projectile. Having said that, both were very accurate as well. It seems most powders can get a load to MOA in 260rem, just seems to be a fairly accurate cartridge.
