I don't own a BFR 30/30, yet, but I played around with converting a 45/70 BFR to 7.62X39. The muzzleblast is close to a "religious expierence" and I don't say that in jest. If you are not a fan of flash, flame, smoke, recoil and concussion don't touch one off.
I have been told that the 30/30 in just as bad as the 7.62X39.
If you order one don't even shoot it until it has had a trip to Magna-Port. Save your wrists, elbows, shoulders and forehead the trauma.
I wonder if the BFR could handle the 25/35? That would be fun!
Lapetit