A couple of details on the Hamilton-Burr dueling pistols.
Most dueling pistols were smooth bore with no sights. Hamilton had a pair of .45 cal. smooth bore dueling pistols. He borrowed his brother-in-laws because they were .50 cal., rifled, with sights.
Prior to the Bicentenial in 1976, the pistols were taken out and taken apart to facilitate making a duplicate pair. When they were taken apart, it was found they had a single set trigger mechanism. Hamilton must have known about that, while Burr didn’t. That changes history.