Greetings @Three O'Three,
There is plenty of data for the .30-40 Krag. Hodgdon has plenty on their load data section. I have both .303 and .30-40 rifles and the data is quite different with the Krag being held to lower pressures. If you have some specific queries I can probably help you with them. I have some pressure tested data for it.
Regards Grandpamac.
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