I just ordered a FN PBR XP action (win m70 short) from CDNN, and am deciding now between the 260 and 6.5 creedmore.
Mrs. Walter has a 260, and shoots factory ammo, so I have a ready supply of 260 remington brass. I bought 1,000 rounds at a store closing - $4.49 per box of 20, so I bought them all. FIgured it was worth it just for the brass....
I also neck down 308 brass, and it works just fine if I'm not trying to make my 260 into a 6.5 mag.
