My .375 Ruger was built on a JC Higgins M50 action by Bill Leeper. The donor rifle was originally a .270 Win so there was a fair amount of metal work to be done on the action. We kept the factory bottom metal and safety put replaced the trigger with a Timney.
I ended up with a rifle that feeds and functions as smoothly and reliably as my FN .35 Whelen - and that is saying a lot!
So in my opinion, the Ruger/Mauser combination is almost a perfect match as long as one gets the right gunsmith to dothe work.
I coudn't resist.