"A new sonographic technique for demonstration of the common bile duct is described in a prospective study of 200 patients. The mean diameter of the normal common duct was 4.1 mm. A common duct greater than 7 mm in diameter can be seen in (a) nonjaundiced patients with Gallstones and/or pancreatitis, or (b) jaundiced patients with common duct obstruction by stone or tumor. A common duct greater than 11 mm in diameter is strongly suggestive of obstruction by stone or tumor."
if normalsize of duct is 4.1mm diameter and it could be up to 7 mm diameter die to Gallstones etc.
then
How 27.3 diameter stone will be flushed through 7mm max diameter bile duct? Just plain impossible. Whatever it is it was in your intestines/colon not in your gallbladder.