In the first few pages there was some pretty firm opinions that it was concussion causation. I didn't intend to upset the apple cart by suggesting exposure to nitro particulates causes headaches...I just mentioned the possibility. Anybody who has ever done any blasting in mine, pit, roadbuilding or quarry will confirm. Of all the hazards in shooting, personally, I would fear detached retina more than anything and thusly avoid hard kickers.
