RE: .280 loads for elk?
Winchester loads the 140 gr Failsafe in factory form. It is the only factory load I shoot in any of my .280 REM rifles. It will kill any elk ever made no problem. The failsafe is an excellent bullet and due to its design you can use a lighter weight bullet that will expand properly and easily penetrate all the way through. This is a do it all load for the .280 except for the larger bears, if you are shooting factory fodder. Hornady light mag is only made with the 139 gr loading.
Personally I shoot the 160 gr Nosler Accubond at everything I shoot with the .280 in my handloads.