There is American made 7.62x54R ammunition available, if you don't mind buying an American product. It is reloadable, but not cheap. It seems like only 20 years ago just about the only 7.62x54R available was Norma and it was not cheap either. In fact, it was very expensive. However, I don't remember seeing any Mosin-Nagants around at the time. Wonder how many are left?
Shoot low, sheriff. They're riding Shetlands!
Underneath the starry flag, civilize 'em with a Krag,
and return us to our own beloved homes!
Buy War Bonds.