Looks about right, in English units the length should be 2.1" (max case length) and finding unfired rounds with slightly shorter than max length brass is very common.
My vote would is for 7.65 Argentine Mauser.
Btw, it uses the same bullet as the .303 Brit, 7.62x554R Russian and 7.7mm Japanese.
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All else being equal (and it almost never is) bigger bullets tend to work better.
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