Older post but what tha heck.
At present I do not have anything in a .308 magnum on hand. This said I have had a lot of experience with the standard .300 Win mag. In years past i would have said it over others simply due to the versatility of loads.
Nowdays, I have two belted mag, one a standard 7mm Rem, and the other a STW, both based on the Sendero. If I were going to pick a 30cal mag to replace either, I would simply rebarrel one of them to the 300 RUM and be done with it.
With the powders and bullets available, it can go from '06 levels to howitzer levels, and is more than capable of anything I would ever take to the field after. In shooting my friends, I have become fond of hitting long range shots repeatably, and with plenty of authority. With any one of my '06's I am good with up to 165gr loads and where they leave off the RUM takes hold and runs away with it.