.62" - .68" I am calling this a .69 because the actual size of the .69 is .65. If you look closely, there is a clear indentation of an incisor tooth. Animals gnawing show considerably smaller indentations while these are much larger.
Recent research by a medical school in the Midwest that shows, in fact, some of the bullets that had been found on battlefields and claimed to have been chewed on by Civil War soldiers, in fact, were chewed on by Civil War soldiers. They were clearly made with human teeth. We also know from compression tests done on these bullets that, in fact, human teeth can bring enough pressure to bear to dent an original Civil War bullet