I've had so many BBs like that.... they SUCK. I had a tool at one time, it was an expanding thingie....the more you cranked on it, the tighter it got inside of whatever you were trying to take out. It worked great. But it "disappeared" several years ago, and I haven't been able to find one since. The REALLY bad BBs I cut the cups in half with a one-hand hacksaw blade & holder. If the shell threads get buggered up a little, I just retap it. Like you, apparently, I try all other options first, though.