Only problem I know if with re-loading 9mm is it is technically a tapered case. The carbide dies reduce this to a straight walled case for most of it's length, leaving a much sharper taper at the bottom. This working of the brass will reduce the number of times you can load the case before it splits. If you get a set of the old style plain steel dies the sizing die has a proper tapered shape inside that doesn't work the case walls, but does require lubing the cases before re-sizing them. Best of both worlds is a Titanium Nitride (TiN) coated steel die which doesn't require lubing before re-sizing and has the proper tapered inside shape. You can get these dies from
CH4D