It is not marked 7.65 X 65, it is marked 7.65 - 65.
Most likely 7.65x53 Argentine, the FM standing for Fábrica Militar de Cartuchos de San Lorenzo, San Lorenzo, Argentina and made in 1965.
I can't find what the SF stands for but it is a standard marking.
I googled several references to soft point bullets. Is yours?
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