Stijn,
200 rounds loaded and ready to go, sounds like enough for a good trial. Glad to see you've got a handle on it.
You may be able to tweak your Dillon powder measure a little more by cleaning it. There could be a some residue from the original machining oils, or some of that Czechoslovakian powder you started with inside that die. I use rubbing alcohol on a swab or cotton rag to clean out excess gunk.
Dennis