If we're talking generally about the .260 Remmy now, which is one of my favorites, I'll spill the beans about the whole mess.
Any 100 grain bullet (Sierra, Nosler BT and PT) with 45.0 H4350 for me has been a winner. 45.0 grains is on an accurayc load and is roughly 3-4 grains under max I believe but it was so accurate and killed so well I shot this load for years. Recoil is nothing and this has accounted for many, many critters both long and short range. The 100 grain Sierra is probably the most accurate 6.5 bullet I've tried, going in the .2's.
For an all around load at .260 Remmy velocities, the 120 BT or the 125 PT gets my nod. Personally, in the .260, I'll never run 140's. If I did I'll go up to 7mm. 120-125 is where it is at for the .260 IMHO...
Love the cartridge...