User blog comment:Kitahara/Recording drum expedition success rates/@comment-24155103-20150116040851

http://s27.postimg.org/e7apvke2r/Expeditions.png

A bit old, but it should still be relevant, definitely seems like there's a cap for Great Success though. Mind you, that isn't data from my own tests so I can't back up it's authenticity, but I doubt it's falsified.