tigerbait,
I'll tell you what. Go to the range, load a 12 gauge with 1 oz. slugs, hold the butt about 1/8 or 1/4 inch from your shoulder, while sitting standing off-balance, and pull the trigger. Then come back and tell us what happened.
EDIT: Looking at it more closely, though, I think I see a bolt. These may be some high caliber Magnum, like a .458 or .475. Hard to tell.
Russ, NCNE