Its a good idea that whenever you get a new reel (of any make) or resurrect a reel you have not used for a long time, to practice loading it a couple of times in the daylight with a scrap roll. If it loads, its ok, if not, its not. How it clips on to the film, is it centered enough, and other possibilities come into play.

I don't think you will find any reel measurements real uniform so, by itself, is not the answer. Then again, I am not a real reel engineer, so may be wrong.l