Thread: Strange marks on brass

I once had a very small mark appear on the shoulder of my 223 brass after firing. It was a very small depression which I found was caused by a bit of muck in the chamber.

What I am seeing on your photos are the opposite ie not depressions, lIke you say, bubbles. The only time I have seen that is with a rifle that had serious corrosion in the chamber in the shoulder area aND the bbubbles were for med by the brash flow in ino the pits. Out of interest, does exactly the same pattern appear on each case? Myself I wouldn't be using them. The only thing that doesn't gel, if it is corrosion, is why is it just in the shoulder area.

The other thing, is that a verticle split at the base in your first photo? If so she's only good for the bin.

The big dings in the rims indicates a rough life. Once fired mmmm.....?