I started a project to convert 9X19mm brass to 9X18. I'm transitioning to the nickle steel/aluminum cases. I Received my 9X18 makarov engraved case holder and trim guide. I took it on faith that the guide was the correct length, till I noticed several cases having minimal material removed. (After trimming 500+ cases.) Got out the digital micrometer and measured .740" case length. Load Manuel's say .708". Grrr. Lots of time and effort. Looked up starliner brass and decided that was the way to go. The 9X19 is now going to be made into .401 I words.