Winchester? 7.62x54R

I have a brass caed 7.62x45R Round, brass boxer primer, GM FMJ bullet. It is headstamped “W 40”. Was this made by Winchester and is “40” the date, if so, who was it made for? The bullet appears to be a standard .30-06 M1 ball, am I correct about that?

I could be wrong, but I seem to recall that they were a Winchester contract for Finland, in 1940.

Yes, Finnish army ordered 50 million cartridges in 1940. Final contract was 21 million and they was loaded by East Alton and New Haven factories.

Thanks, I knew it was a contract load for someone.