Re: How not to yank the trigger....
I know the fella well. He is a top shooter.
I guess he was eager to make the vid with a new rifle not properly adjusted etc.
Poor form, thats correct, but the comments about coke could be spared.
Re: Reaming Muzzle Brake
My experience is that you can easy go up 1mm above caliber and not notice any big difference. I've used 338 cal brakes on 30's, and 30's on 6.5's. I think its calling for trouble making it to close.