So you are saying at "A', they reset the count to zero?
The 767,000 serial number WAS a .300 Savage. An R model. I changed it to 22-250. I took that .300 barrel and put it in an auction box. If it had square threads I would have put the lock slot in and sold it on ebay. People bid on T/D barrels like they are gold plated, even though they probably will not fit anyway.
I am pretty sure the .308 and maybe the .243 was being chambered before 1960. I am going with the change in threads came about when they introduced the longer cartridges. One million was probably a nice round number someone just picked out. I have never seen any reference to the thread changeover period in a book.
There is just not enough information to know. Really, until more .308 based cases became available, how many people wanted a barrel replaced on a solid frame 99 Savage?
