My son has a Ruger American 450 Bushmaster Ranch with that awful muzzle brake and yes, it is deafening to shoot. I have tried heat and a good fitting 7/8 wrench but this thing will not budge. As a side note to all of this, I use a Magneto Speed chronograph and the blast from the brake keeps it from registering any speed. Any help/advice would really be appreciated.
Murf