I want to apologize upfront for a coming wave of questions from me on reloading. Please have patience with me!

That being said, I've made it to stage 2, installing and adjusting the powder die. But my excitement was dampened by adjusting the bell and measuring cases for before and after belling. I'm reading in manuals that the case mouth should be approx. .002 bigger than case body; but I guess the bitch of it is measuring the spot on the body the same place before and after checking the bell. I guess the curve ball to me is that despite appearances the 9mm Luger case isn't a true straight wall case.

Is there a trick as to measuring case bodies or is this just the nature of the beast? Or is it easier to just open the bell incrementally until a bullet is able to sit upright on its own in the case and stop?

Thanks again for the help fellas.