I shoot at a private outdoor range and many shooters leave their brass - I pick up range brass and reload. I have reloaded 45ACP for decades - lately I have seen a rash of 45 brass that has some form of bulge that prevents reliable functioning and I am using a Lee undersized sizing die. No, I do not know why there is so much bulged 45 or where it is coming from - confident it is not coming from my 1911. I have been case gauging all my 45 reloads and putting the "fails" in a box. The percentage of fails reached a point that I needed to do something so I bought a Lee Bulge Buster kit along with a second Lee crimp die. Using a RCBS single stage press, I set up the Lee Bulge Buster kit and ran all my "bulged" 45 though. Seems to work well and seems to have saved a bunch of 45 reloads. I will try 9mm next.