I measured 15 Speer 115 grain 0.355" (9mm) TMJ RN Plinker bullets and got an average of 0.5704". The bullets ranged in length from 0.5685" up to 0.5725". The median and mode were both 0.5700". I think I have some 100 grain Berry's plated bullets, but I am not sure where they are. If I find them I will measure 15 of those and see what I come up with. Measurements were made with a Mitutoyo CD-6"ASX digital caliper.