I loaded 9mm for years on a 3 die Lee set up in my Dillon 550. No problems.
Then, all of a sudden, i would get the odd round that would not chamber. Too fat.
I use range pick up brass and soon discovered that a brand of east European brass was causing the problem.
I installed a Lee Factory crimp die to take over crimping duties (just enough to take the flare off) and it also sized the occasional fat case.
This might reduce the accuracy of such a fat round, but it does guarantee 100% function, which is more important for my style of shooting.