I met a young guy this weekend at Sportsman's Warehouse.  He has just got out of the Marines, and settled here in Fairbanks.  He has been looking for a long range shooter to shoot and hunt with.  Plus a place to shoot.  Invited him to meet me out at the river.  I showed him where I shoot, and the back stop is located where any misses and bullets go into the Army impact area.  A totally "Off Limits Area" due to unexploded ordinance.  It will be off limits for ever.  He shoots a .300 Ultra Mag, with a custom military scope on it.  He was impressed with my .338/378 Weatherby, and the cartridge I shoot.  After we shot a while, I moved my gong from 1000 yards, out to 1500 yards.  I was hitting my gong at 1500 yards, and having a good day.  The Gong is 24" X 24".  Now I will admit I was not hitting the center every shot, but I was hitting the gong every time I pulled the trigger.  (OK, I was showing off).  He hit four out of five.
Then I pulled out my 25-06, and he pulled out a 30-06.  Shooting milk jugs.  Starting at 400 yards, we both did good all the way out to 700 yards.  We both feel that is the practical limit for those two cartridges.
I think he can be an asset at Caribou camp this year.  We are more interested in shooting Wolves than Caribou.