I suspect once USRAC took over making the Winchester rifles, was important to look at more that just the "Model 70" - I had bought a Model 70 XTR in 308 Win in 1976 - "new" from a store - I also have a Model 70 XTR "Sporter Magnum" in 338 Win Mag made about 1981, and now a Model 70 "Westerner" in 22-250, also made in 1981 (I think) - all as per the roll stamps written on the barrels. For a while I owned a Model 70 in 375 H&H - it had the anti-bind slot on the bolt, so must have been early 1968 or so, although I think the serial number shows made in 1967 - the barrel roll stamping said "Winchester - Model 70 - 375 H&H Magnum". Even when WRA was making the "pre-64" rifles, they had a particular earlier version, also called the "Westerner" - so 26" barrel in 264 Win Mag (I've never owned one - just read about them). I also read they marketed a "Model 70 Alaskan" - with 25" barrel chambered in 338 Win Mag. I think USRAC was broke about late 1990's or early 2000's - when FN bought them out? So, for sure, not all "Model 70" the same - even when made in same year. Somewhere in mid-1980's was a Model 70 "Ranger" which had a blind magazine, I think.