Help! Weird wrinkling on brass

[Rocky Raab]

That's possible. but the more likely thing is simply too much lube. Those are called "oil dents" and they happen when lube gets trapped in the shoulder area with nowhere to go. So it collapses the shoulder into grooves or wrinkles.

Swab or spray out the die again (sorry!) and repeat, but this time make sure there isn't excess lube. How much is excess? If you can see any, that's too much. Also try to avoid getting any at all on the shoulder, and be VERY sparing on the outside of the neck.

I bet that fixes it.

That's why I prefer Imperial Sizing Die Wax. I just wipe my thumb and first two fingers across the top of it. Just picking up the cases and placing them in the shellholder is enough. I reswipe the tin with my fingers every ten cases.