Follow up question, in what situations would it have been used? Was it more popular among certain types of soldiers (i.e,. line infantry, skirmishers, cavalry, etc.)?
In respect to the infantry, it was not common. The standard infantryman would be assigned a box of sixty paper cartridges that held a solid shot ball and enough powder to pour into the musket and the pan of the musket. The danger of buck and ball comes from the dangers and chaos of combat where it wasn't uncommon for a scared conscript to fire his ramrod at the enemy or worse, have a misfire and not notice, causing him to reload the musket twice and risk an explosion that'd most likely be fatal.