I've had a win.70 in .264 for many years. I don't shoot it a whole lot at targets or varmints, so i have not "shot the barrel out" yet. I can't shoot those 3/4 inch groups I used to but that could be the operator. With it I have shot: white-tail, mule deer, antelope, elk, moose, bighorn sheep, black bear, coyote and the heads off a few grouse.

If I was looking for a "medium to long range deer sized game cartridge" I'd take a .264 mag. or a 6.5 rem mag. before building a 6.5/284 or a .25/284.

Robin