They however do have non-uniform lengths. If you don't trust me, take a batch of brass with exactly the same headstamp and measure their lengths - I've calculated hundreds, they do to be a truth change in size. With all the FC brass I calculated, Serious spread was all around https://reloading9mmammo29628.tkzblog.com/36553353/the-5-second-trick-for-9mm-casing