They on the other hand do have non-uniform lengths. If you don't trust me, have a batch of brass with the exact same headstamp and measure their lengths - I have measured hundreds, they are doing to be a reality vary in length. Along with the FC brass I measured, https://9mm-bullet-reloading18406.blogadvize.com/45644947/the-2-minute-rule-for-reloading-9mm-ammo