The most accurate rifle I have is a Winchester M70 Classic Stainless from circa 1992.
I do retain 2 Remington M700 safe queens because they are almost as accurate as my M70.
The tiny sheetmetal extractor that shaves brass and clogs up the tiny little plunger ejector is why I got rid of others and never give an M700 a second glance.
Near Manufacturing in Alberta Canada makes an outstanding Picatinny rail for M70 LA & SA,
they even have one for the 0.330" hole spacing on the rear of the .375 H&H-length "Express" action.
Here is an old site that will give you a good telephone number to call Richard Near.
He has a newer site, which I do not recall, but he can tell you Nearly anything you might want to know:
http://nearmfg.com/index.htmlThe recoil stop on the bottom of this M70 LA Picatinny is a super feature.
My NEAR deserves another .458 WM+ project.
This one has a 25-MOA tilt, they can be custom-ordered with up to 75-MOA tilt:
Matte stainless steel or nitride coated matte black stainless steel.
All the same steel, you pay 10 bucks more in USD for the black coating.
Near supplied 10,000 of those bases for the FN/SC/Portugal tactical-outfitted/police/military M70 Winchesters.