What "Pre 64" has done for you and folks 'similarly situated', is providing a laundry list of considerations in bolt variations. Some appear likely focus in collector concern context rather than just functional match. Others 'must adhere considerations lest further grief. '06 cartridge head diameter such central issue.
Most likely time, patience & vigilance the key to the 'eureka' moment. For me, I'd simply not buy into such a rifle in any other context than itself "parts gun"! Upfront costs and too many 'ifs' remaining for unwary buyer.
After this Forum further resources, Gunboards WTB and Winchester Collectors Association Forum.
Good luck!
John
