If I didn't have any powder on hand I'd probably order some RL 17. But as I have many pounds of Ramshot Big Game and Hunter I use both in the 260 for that bullet weight.
I've stocked up on quite a few hundred 123 gr. A-max's and will start making a load for them for my son's 260 in the next week or two when he is back from college.
We have been using the 95 gr. V-max for woodchucks but the 123 gr. A-max at 3000+ fps seems to have possibilities.
I'll let you know where I end up at.