Went to a local show today and had some fun digging through the bins of loose cartridges. Pulled out this cartridge and gave up $1 for it.
Originally thought it was a rare Jager 7.62x54r, possibility WW1 US Reserve issue. Lined up to an identified cartridge, it matches to 54r in most dimensions except shoulder angle. Any hints to what this may be?

https://ibb.co/x2mvJqN
https://ibb.co/58pbFjV
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