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If I remember correctly, the historically accurate RB size for military style paper cartridges is .650 so they can load down a fouled barrel. You might find this a bit loose and less accurate unless you plan on firing 40 shots in quick succession. I'd recommend trying the .675 ones you have, but they might get hard to load after a few shots. Personally, I've had good luck with .662 sized RB with paper cartridges in my 69's.