I'm guessing that the seller measured the chambers and, since it measured out at .390, assumed it had been bored out since it's larger than the .375 or .380 now in use.
Boy am I glad we never switched over to metric.
"Dave Tutt drew his Colt 1860 Army 11.19mm and leveled a shot at Hickok, and missed. Hickok calmly drew and fired his Colt 1851 Navy .10mm and did not miss."
Naw...
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