I reload for a 260 REM (pretty well the same). Some bullets you'll want to try... I load mainly 130gr Nosler Accubonds with H4350. Its a great shooter. You can also shoot 125gr Nosler partitions if you need a little more speed. You shouldn't have any trouble with 140's either but don't expect to break 2700 fps... you'll get the best accuracy with 140's in the 2600-2660fps range. Lots of powders that will work. You will probably get the best speeds with RL-17, and H4350. H4350 generally gives great accuracy. Varget will give great accuracy, but speeds will generally be a bit slower. 6.5 Creedmoor is a fantastic round.
Also note: If you're reloading and can't get good accuracy with H4350, some people report H4831 gives them better accuracy... Just a random piece of information. : )