You are correct about Lee not supporting or advising using the bulge buster on 9mm due to the case rim and slight taper. They used to not advise against it, but now do. However, using the bulge buster with the 9x18mm (Makarov) die, it will work. You force the case up thru the die which will remove the bulge near the rim. I use mine more for .45 ACP. I\’ve used the 9mm a number of times, but usually just toss the bulged case instead. There is a real concern about re-forming the brass like that at the case head. The concern is it weakens the brass and then you have a case head separation upon firing and that is a big, big problem. After I size my clean, de-primed brass, I drop it in my Wilson case gauge. It should fall in flush, no pushing and then turn it over and drop out on it\’s own. If the case is ALMOST flush with the case gauge and a little/lot of a push will make it flush and it won\’t fall out on it\’s own, the case is bulged. If it\’s bulged, it goes into another coffee can for later. I do the same procedure again with my finished rounds before I put them into my inventory. It\’s sounds overkill, but it really only adds about 3 seconds total per round. I have good tunes on and I enjoy the time and great results.
P.S. You need to purchase the bulge buster kit and the 9×18 die separately. You need both.