Late to the party but just for information's sake:
See belowI've got a decent amount of .30⧸30 put aside to feed a Winchester 94.
I have no experience with the BFR revolver. But I've owned T/C Contenders a few times, have had a couple of .30-30 barrels. With the 10" barrel, I had more favorable experience with faster powers than are typically found in .30-30 rifle loads.Another factor; I am familiar with the ballistics of the .30⧸30 WCF out of a lever-action carbine. Not so much out of a 7½" barrel. Certainly different.