No first hand experience with it on elk , but a friend of mine bought a model 7 youth for his grandson in 260 several years ago. The grandson is still shooting that rifle ( put the full size stock on it) and has laid low a slew of antelope,deer and elk, and a cougar with that rifle.
It's the ballistic twin to the 6.5 swede and that ol girl has a long and healthy track record on things from tiny to quite large.
Get your 260 put it thru the paces and find your best load for it. If you put a bullet where it needs to go, you won't be disappointed.
Elk shot in the ass with a 338 a half dozen times won't be any deader than one shot thru the heart/lungs one time with a 260.
