Thread: Trouble with seating die

So I ended up buying new dies and they actually arrived. Lyman 8mm mauser dies.

Everything was going great until I went to seat. It got tighter than normal and after checking 3 cases it was blowing the shoulders out or imploding. What causes this?



I put a empty case in just to see and this is what it came out like



When I look into the die I can see the lip that is causing this. Why is it there?

I ended up solving the problem with a budget fix so I could do up 50rounds so I have ammo to shoot off by winding the die right out like so



With it being wound out like that I couldn't push the case in too far making it get crimped in by that lip but I would like to know why the lip is there? I thought it'd be a crimp maybe but then it shouldn't crush my cases or blow out shoulders if that was the case right?