I was shooting my Buckmark today, used cci standard, federal bulk no problem. Tried remington golden 550 6 th round exploded when I pulled the trigger. Destroyed rear sight base, guide rod, firing pin, block that holds firing pin, and powder burnt the heck out of my support hand. Recoil was stout for a .22. Picked up spent brass 4 ok, fith was cracked and head was bulged, the one that exploded left nothing but head in my mag well. Looked like case head separation on a centerfire case. Any one everbhavethis happen? I have had failure to fires and under powered .22, but never over pressure.