RE: advantages of the .260?
Yes, Briman, 8mm is a great size. When properly loaded, the 8x57mm Mauser is one of the great all-around cartridges. Great for both deer and elk out to 250-300 yards or so. Also way cool for bear, moose, caribou, or anything else you may want to shoot.
Personally, I'd love to see the 8mm-08 or the 8mm WSM. They finally may give a great caliber its rightful place in the pecking order.
Good Dogwork and Good Hunting