This is not true. The pre 64 Winchester model 70 although made on an assembly line was final chambered and fit by hand with the bolt individually fit by hand and then electro pencil engraved with the rifle's serial number. Depending on the caliber and/or era, there were betyween 4 and 7 chamber reamers used. They used both finish reamers and burnish reamers earlier in the production for final headspace; after 1952 they eliminated the burnish reamer and recessed the bolt face for final headspace.
Individual rifles were initially test-fired and sighted in and later bore-sighted when technology advanced.
I rank pre 64 Win 70 in this order:
The best were 1948-1951. These were still finely crafted but had all of the changes to permit optics in place.
The finest made were the pre Wars, 1936-1947
Still pretty darn good but short cuts beginning were 1952-1958.
From 1959 the shortcuts just kept coming; later are ridiculous.
I have only done it once,but everything lined up perfectly and head space was ok. Remember,those rifles were massed produced and not chambered after the barrel was installed. Any barrel was screwed on, head space checked and proof tested.Then sent on it's way to be sold
