Basically identical to DanielCarmi's 9mm, 8 round, ammo box (remix source). I just added a couple chamfers and changed the font.
Totally screwed up a clearance between the two pieces, so its going to be tight. Ive uploaded new files with it increased.
Fits rounds 30mm tall, mileage may vary when you get into HPs and exotics.
Solidworks files, as well as IGES are attached.
If you'd like to make this fit a different round, simply modify the 'base' file, as the other two are derived from this. Youll have to adjust the height the 'top' in the 'base' file, and then the height of the 'bottom' in the 'bottom' file.