I was cleaning my shells and noticed that there were some with dents, others had smaller marks and dents in the same area of the shell, and nothing on others. I have never seen this on the other caliber [9mm] I reload. The pistols are S & W Bodyguard AND Ruger LCP. I reloaded using New Shells to make sure it was not from old ones i picked up at the range. Each made similar marks on the shells. Then I kept the shells separate to see which pistol was making the dent. Anyone have any guesses on what is making this dent? The picture is of two of the heavy dented ones just to have a good picture.