Scrub the chamber good- I have used a .410 bore brush with some solvent, chucked into a drill (spin brush for about 30 seconds, then clean oversized patches, then check using new ammo, carefully extracting. and see what you have.
I have dented brass when reloading because of excessive lube on a casing. Brass is soft- the steel of the chamber is hard.
What we have here is... failure- to communicate.