.311" after passing the expander ball on the way out?
Then it is way too small for 8x57. You need to talk to Hornady. Your die is either cut too small, or maybe mismarked (not actaully and 8mm Mauser at all). Either way, the Hornady folks will get you straightened out.
__________________
All else being equal (and it almost never is) bigger bullets tend to work better.
|