jwp475, Here is the email I got from NF: Scott,
Thank you for your interest in Nightforce Optics.
We offer bases for Winchester model 70's in the following configurations, Short Action, Short Mag, and Long Action. I believe that the Express action has a slightly different spacing that makes it non-interchangeable with our Long action base.
I did call up Winchester and this is not a base we make.
Sorry for the bad news, try Warne Scope mounts as they offer many bases we do not.
Regards,
Ken
I got my NF base today from Optic plant and It DOES have the 3 holes just as yours!! It does fit the rifle too. NF doesn't know their own products very well.
Thanks for your help.