...that is a bullet bonding to the cartridge case over time. Eg:I decided to run some Hornady SST'S and GMX'S through my hunting rifle and found the loads showed signs of high pressure,tougher than normal extraction and catering primers and these were from the same lot of loads exactly. So I returned to my bench to find out why and pulled bullets with great effort and seated some deeper and heard a click.
Of course then I started to do some reading about this and is a real thing.I was using Hornady brass, and all other components checked out to.
I have put this info out there and have told all kinds of things and some disbelieving me.So ,What have you experienced?( I don't tumble clean and wipe out necks of Hornady sizing wax ) Tony