This guy has a .60 caliber rifle with 26" barrel and no muzzle brake, that weighs under 16 lb
what loads does he shoot?
In his own words "In my rifle, I use 160 grains of 4831 to launch the 900 grain bullet"
I am no gun expert but that does not sound like a pleasant day at the range for the shooter's shoulder.
He is planning on using it to deal with brown bear in Alaska.
full story here: http://www.calpappas.com/id29.html