I picked up a Rem. XP100R in .260 about 3 months back. I was hesitant about getting the .260 cause I had several calibers close to that. After getting it, loading a few rounds, WOULDN'T TAKE FOR IT.
I have loaded some 120 grn Speer Hot Core Spitzers with IMR 4895 and some Varget. At 100 yards my first load of Varget is putting three shots in a group under 1/2". The IMR 4895 will shoot 1" and probably with a little tweeking on the OAL it might get better. The Varget is clean burning and is very consistant in Velocity. I'm getting 2560 fps with the first Varget load. It is shooting one inch hight at 100yd and at 200 it's about 1" low at 200 yd. I have a 2x6 Baush/Lomb pistol scope on it right now but I'm saving for the Burris 3x12 B Plex to get all of the performance I can out of the .260 and Nosler Ballistic tips.
I have a 7-30 Waters, 309JDJ, but the .260 fills the gap between them.
Go for it. I got mine on Gun Brokers . com.
Mike