Noooooo
That's way off. Basically it concerns post 64' models using the push feed bolt (no claw, XTR models etc.) up UNTILL the reintroduction of the controlled round feed (claw along side the bolt) well before the plant closure.
There are tons of great Model-70's in those "questionable" years. Switching from hands on to automation took its toll on form, fit, & Finnish. I own Winchesters from pre 64 to plant closure.
In short, it boiled down to cost, & greed from both the workers, & Winchester. Sad. Everyone has to bite the hand that feeds them. But there are plenty of accurate rifles even in those "off years" of low cost production rifles. I own a few, & none shoot over MOA with handloads. I will say that I had to float the barrel, & bed the action of my XTR 300wby before I could CONSISTANTLY get sub MOA. But it averaged 1-1/4" groups BEFORE that, with occasional sub MOA groups. After the float/bed job I gave it, I shot a 4-1/16" five shot group at 541 yds with factory Hornady box ammo180gr. Now it consistantly shoots sub MOA five shot groups with factory Hornady ammo, & handloads too. Just sold it to a buddy who is extatic. It's the most accurate rifle he owns. Not bad for a rifle from the "off years" imo.
I also plan to own quite a few more Winnies, & I'm looking forward to owning a few of the new FN Winchesters too.