My M700 chambered in .280 Rem is the best sheep hunting gun/caliber (IMO)
The .280 Remington loaded with 140 grain Nosler Ballistic Tips, and currently 140 grain Accubonds behind RL 19 is an ultra-long-range sheep slayer par excellence. Loaded in my customized remington M700 BDL DM weighing in at 7.5 lbs loaded, it has proven to be devastating on sheep (and everything else I have hunted with it).
If I could only have one gun, this would be it.