Greetings @johnd,
My old Lyman Manual lists 21 grains start to 24 grain max of IMR4198 for the 213 grain in the .30-40 Krag. AR2207 is very close to IMR4198 and the .30-40 Krag is very close to the .303. The velocities were 1,554 and 1,769 fps respectively. These loads were not pressure tested so work up slowly.
Regards Grandpamac.
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