Take one new round and measure it.
Then shoot it and measure it.
Last take the same round and run it through the resizing die, then measure that.
With the 9mm being a "tapered" case, don't forget to measure the mouth of the case.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)