Personally, I won't shoot a .500 Linebaugh.
Several of my friends who are big bore fanatics (they shoot full power .475'sa for fun) have managed to dent their hats or cut their heads with .500 Linebaugh revolvers.
To me, after a few cylinderfuls of full power .475 hunting ammo, full power .454 loads were mild and just what the doctor ordered to fight off the flinchies.
A .500 Linebaugh five shooter is just a bit more fun than I can tolerate. I will let you guys tell me how much fun they are.