I have cracked 4 sets RCPBS and 1 set of Lee re-sizing dies. They always give me a new set and say it's never happened before. I am following the instructions to a T. What could be going wrong? They are for a 338 Lapua. The die always cracks all the way up the threads top to bottom after less than resizing 10 brass?

I need to load up for spring bear
I need to load up for spring bear