Lots of good, effective loads.
I'm getting interested in the new 156 EOL Berger, have some headed my way.
I don't have a .260, but do have Creed, Swede, 6.5-284 and 26 Nosler.
Berger was showing 2,800 fps with the Creed, using RL-26. That's pretty fast for such a heavy bullet in that round. They only give 156 EOL data out over the phone, haven't published it yet. I just sent Berger an Email, asking if they had actually pressure tested those loads. We'll see. They're faster than Horn max, but Horn didn't include RL-26 and their data can be conservative.
Anyway, with a B.C. of .679, that bullet does well at long range, at least on paper. With the Nos pushing it at 3K fps, the 6.5-284 at 2,850- 2,900 and the Creed at 2,800, the Hornady Ballistic Calculator has 500 yd drop numbers between those three closer than I would have thought.
All 4 of the mentioned rifles are 8 twist. A .260 8 twist with that bullet could be interesting. I'd think RL-26 may be a good one to try.
Curiously, Berger had RL-25, RL-33 and Vv n-570 as their powders of choice for the 6.5-284, n-570 the speed champ at 2,905 fps.
Their 26 Nos line up had n-570 as the speed demon at 3,114fps, 90% fill. Others were H-50 BMG, RL-50, U.S. 869, all running 3K+ fps, with 92-99% fill, no compressed loads. Of course, I have all of those. Just don't have Vv 20N29, another good Nos powder.. But, I have enough powder to finish off the barrel if I work at it...
About 400 round count with some Hawkeye changes to the throat. Still sub MOA. Probably good for another 400, maybe 500. Don't think I'm gonna go there.
DF
