I have followed this thread for some time as I was having the same problem. Loading LSWC 200 gr cast bullet with gas check wax not powder coated. Cases were having a slight bulge and not chambering in my 1911. Purchased a different brand of cast 200 gr LSWC wax with gas check. No problems. Did not measure bullets, just let the 1911 decide if the problem was corrected. New bullets reload and shoot fine.