I picked up some .223/5.56 brass for reloading. A couple hundred of them are head stamped WCC at 12 o'clock, 06 or 09 at 7 o'clock, and a small "s" at 5 o'clock. All of these cases have a rim diameter of .360" instead of the normal .378". I didn't notice the under sized rim until I started priming them and they kept popping out of my hand primer.
I've never seen the "s" before, anyone know what it stands for?
These were supposed to be "once fired" cases and it doesn't look like the rims have been turned down. Any ideas why they would be under sized like this? All other dimensions are correct.
Thanks for any help. Looks like I've got more brass for the scrap bucket.