A B Longstreet wrote a delightful book published in 1835 titled "Georgia Scenes", containing a number of short stories that he claimed in the preface to be absolutely true scenes from Georgia. One of the stories is titled " The Shooting Match" and it is probably the best detailed account of the old time matches ever written. In it he describes the use of rifles and shotguns (smoothbores) in the same match. The match he was attending was shot entirely with rifles but he went on to add the following:
"In olden times the contest was carried on chiefly with shot-guns, a generic term which, in those days, embraced three descriptions of firearms; Indian-traders (a long, cheap, but sometimes excellent kind of gun, that mother Britain used to send hither for traffic with the Indians), the large musket, and the shot-gun, properly so-called. Rifles were, however, always permitted to compete with them, under equitable restrictions. These were, that they should be fired off-hand, while the shot-guns were allowed a rest, the distance being equal; or that the distance should be one hundred yards for a rifle, to sixty for the shot-gun, the mode of firing being equal."
He seems to indicate that in the South smoothbores were predominate in his youth, which would be the late 1700's.
Search for the book on Google Play and read the whole story free. It's a great and fun read..