I shot a buddy's 4 bore double ONCE and that was an experience I don't wish to repeat. My .470 NE doubled on me once and that was a handful, pretty much like the 4 bore. I used to have a 450 Ackley that produced 93 ft lbs of free recoil, shooting that from the bench took concentration and focus to a whole new level. Never tried my 50 without the brake, don't think I will either.