J.H. -That's pretty awesome.
Howdy !
If I saw things correctly, the receiver has a stripper clip slot?
That + the time frame mentioned, would seem to indicate the receiver was a M-98 liberated from the " Gerries " in WWII....
or just after. I dunno... maybe Mexico was formerly using Mausers for their Military; too....given the receiver marking ?
I'll defer that to others, more knowledgeable on the topic .
There were plenty of .22-250s chambered up during the years the cartridge was a wildcat. Remington made it a standardized
factory offering in 1965, adopting the iterration w/ the 28* shoulder.
With regards,
357Mag