No, but they have one for rent at the local range. Apparently, no one who has rented it has shot an entire cylinder yet. That may be due less to something inherently problematic with the BFR than the nature of the folks I see renting that type of thing: big on bravado and low on skill and experience.
And, does anyone REALLY think BFR = Biggest, Finest Revolver instead of = Big F-ing Revolver??