I've seen Mr. Munden shoot on Impossible Shot, but never for speed there.
Cisco shoots the single action for speed/accuracy on that show and I've been impressed with his shooting.
But seeing Munden hit those two balloons was hard to believe (pulling 10g's during his draw is unreal too). I didn't at first...I thought I misunderstood what he was doing and that he had them lined up to shoot them with one shot. Even in slow motion he is amazing. The scientist was professional enough to not let his jaw hang open when he was doing his measurements.
He didn't shot with a "beep start" so he would be slower with that. At his age, his reaction will be less than it was years ago, but you can't take much from that man's ability.
I'd love to see Mr. Munden and Cisco do the two balloon shot from a timer start head to head.