Greetings!I have a 98 Mauser which came to me with a multitude of problems( it was severely bubbafied), the one I'm working on now is the fact that it came with Weaver two piece bases installed completely out of alignment, particularly the rear base. I want to purchase a one piece base, either picatinny or Weaver style, that is undrilled, so that I can glass bed it down and drill to the offset holes. I'm not sure of how to align the base with the bore, rather than the reciever. This is not the original barrel, as it's chambered in 30-06, and is unmarked in any way, and I don't trust that the reciever is square or that the barrel does not have any run out. Anyone have a method for doing this? I have a Grizzly benchtop mill/lathe with 31 inches of bed if this helps but I mostly use it for slotting guards for my custom made knives. Any help would be greatly appreciated.
Regards, Wes

Put the barrelled action in the mill vise and using an indicator in the spindle align the action true to the bolt raceway, either with a .700 dia rod installed where to bolt goes or just the bolt. This is a mauser not a benchrest gun and you should be more worried about ruining the scope than than perfect alignmet with the bore. Once the action is true to your mill axis replace the indicator with a the coned end of a edge/center finder. Now dial into each hole and note how far off center you are and use those dimensions to drill your base. Or put a third hole in the rear bridge if a ready made one piece base puts the rear hole in between the ones you already have. Take care when pulling the base down into the bedding compound that you aren't flexing the base, you can leave it in the mill and use an indicator as you tighten the screws to keep it aligned at top dead center.
Don

Thank you, I'll give that a try.

Was just wondering what you meant about being worried about ruining the scope (which I haven't procured just yet).

What Don means is you seem to be more concerned with the offset of the holes and how that will effect your scopes adjustment, When the real reason the scope bases are in alignment to each other they will not torque the scope out of shape possible ruining a good piece of glass. the side effect of having the scope bases in alignment with each other and the axis of the bore is ease of adjustment to zero.