Hi Dave-

Pics would help… 

But in general, the usual factory provision for scope mounting on M70 Nat Match, Target, and Bull Guns was a scope block on the front receiver ring and another one on the barrel.  At the time, drilling the bridge was not considered important.  Using the blocks on the receiver ring and the forward most of the two positions on the barrel mount gave 7.2″ mount spacing, which equated to 1/4 minute click adjustments on the micrometer adjustable target scope mounts of the day.  The bridge of 30-06 Target rifle receivers (with clip slot) were not regularly D&T until about 1950…

I would suspect that holes drilled in the bridge, especially of a target rifle, would be aftermarket.  There are certain characteristics of factory D&T holes that are usually not present on aftermarket holes, but it would surprise me if they were factory.

That said, IMHO pre-war Nat Match rifles are quite rare.  Much less common, in the survey, than even 1st variation (ramped) Target rifles, of which Rule said “less than forty” were known.  I think Roger’s numbers are a significant underestimate of 1st variation Targets, but it seems to me that Winchester didn’t make many Nat Match rifles before WWII.

This is a somewhat rough, but intact, pre-war Nat Match (s/n 41035)… 

I’d like to see pics!!!

Lou