I've never had a stuck case or anything close to it in my life. My dad bought a tumbler with SST media and I thought I would give it try on some of my 338 NM brass that I was ready to anneal. I noticed that the SST media gave the outside surface a peened look but didn't think anything of it. I use RCBS lube on a pad and inside the necks of the case. Went to the press and the first one got stuck in the die. After removal I inspected and cleaned everything and ran a few more through with more effort than usual. Then I had two cases stick back to back. After getting upset at loosing several pieced of expensive brass, I decided to liberally lube the case by hand. Worked fine. Tried adding some dry imperial neck lube and it worked a bit better. Proceeded with extra lube and didn't have any issues and the pressure felt normal. I started thinking that maybe the peened surface caused the lube to get pushed into the dimples and prevented it from working. Anyone with similar experiences?