I learnted boolits at the WECSOG. If the rounds are in spec, you'll get to send some fun emails to the manf. about your poopoo pistol. If it's a racy 1911, might just be tolerance stacking, too. Maybe pants a P30 or M&P or something in the meantime. Pretty scary, and fortunate it was on the range when you found out. Good luck on the troubleshooting mission.
Discussion
It was not on the range, it was in my office. So it was scary. But I resolved it with some careful vigor.