Re: Off center primer strikes
There's an AGI DVD on refurbishing old millitary Mausers.
One of the procedures they perform is welding the firing pin hole shut and then re-drilling it on center and with proper clearance. It's a pretty low-tech operation.
I suppose you could purchase a replacement bolt and/or aftermarket one if they're made for anything other than Rem 700's. Either way, you still need a smith to check your clearances, headspace, etc.
Gretan can probably do it for aesthetics. But, if you are chasing accuracy, then he may recommend truing the action and/or rebarrelling at the same time.