Got "scope eye" pretty bad with a smokeless muzzleloader one time when I shot a buck. I think I bled more than the deer did! That rifle kicked like a mule. The only other time was just a few years ago while walking out of my spot I shot a buck with my 7mm-08 (yes, 7mm-08) while wearing my pack. The butt of the rifle slid off the pack shoulder strap at the shot and the scope bloodied my eye pretty bad. I still have a scar. At this time, that 7mm-08 has the most brutal recoil of all my rifles! It must be the stock design coupled with my hot handload as I do shoot much bigger cartridges. Weird.