Okay, I'm impressed. Bryce is damn fast with that cannon, and that's well under 10" and all centered.
It should be noted that Mr Townsley's 454 has a ported barrel that aids considerably in controlling muzzle flip. The FA-83 that the NRA guys are shooting is not ported. I am most impressed with Max Prassac's time of 3.1 seconds without a ported barrel. If fact Max shot for time one more time after filming was complete and posted a 2.9 second time without the aid of a ported barrel.