Noticed this while inspecting My brass after a trip through the Tumbler. I only have three firings on this Brass, guess I'll be discarding the lot and Parking the lapua until I can get some lapua Brass ordered.
Yep, oversizing and thin brass. What dies?
You seem like a rational person. So consider a mistake as raising the probability of other mistakes -that you don't know about yet.
I suggest you pick up Amazon.com: Handloading for Competition Making the Target Bigger. (9780962692598): Glen D. Zediker: Books
You probably won't put it down once you start reading it.