Be sure to let us know how that Proof barrel does. I'd love to watch some slow-mo video of that rifle. The APA brakes are great because the 12:00 and 6:00 are interchangeable... not only making timing twice as easy, but it doesnt cause the barrel to whip down like some others do. We've steered away from brakes that have holes on top, or ports that greatly favor top or bottom. Badger thrusters ports favor the top of the brake, but not much, and we still use them.
Thanks again!