I would think that if there is any reference to using a patch in a smoothbore, it might occur in some ancient literature relating to the early hand-cannons. Patching a cannon ball would be difficult at best, because there was no consistency in the diameter of the bores of cannons, and even less with the cast cannon balls. Wads would be quicker to use in battle, for cannon. However, when you get down to a 1" bore, in a hand-held cannon, and later, the Matchlock, both smoothbores, a patched ball would be loaded faster even on the battlefields, and be more accurate. These early guns were used in volley fire to decimate rows of enemy soldiers on the field, in much the same way archers were used before them. Accuracy was not required nor expected, but these guns did foul and using undersized balls and patches would be a quick way to load them, and keep the gun functioning. If the patch was lubed, the grease would soften the fouling, and allow the gun to continue to fire much longer before it had to be cleaned. The same considerations existed with the wheellocks, and then with the flintlock smoothbores. If the battle became extended, or the musketeers threatened, they could continue to fire the undersized balls out of their fouled muskets without the patches to continue the fight, and save their lives and equipment.
It would not surprise me that NO literature is found talking about using any kind of patch in a smoothbore gun, simply because the limited nature of literacy in those ages, and the fact that people who could write had little to do with fighting. They remained at " Court " advising the king, or in monasteries, serving the Abbot and God. It is these historical realities about who was allowed to learn to read and write that control what kind of information might be found yet today about mundane matters. The passage of time, and many wars intervening to destroy libraries and records over the centuries, can make Tg's question impossible to answer.
The question is a good one, however. But knowing how much of Europe was destroyed by countless wars, and how any indication of wealth, or writing was often destroyed by illiterate soldiers( even in WWII, where I have heard of this directly from surviving veterans) because they either could not read, or could not understand the language, or thought they were protecting themselves by destroying any enemy writing that might be intelligence for the enemy to use against them( instead of saving it and sending it on to the Army Intelligence officers)has to raise doubts of finding any answer.
This situation is not unique to modern times.The Great Library at Alexandria, Egypt, is still thought to have contained all the world's knowledge to the time of its burning. The Moorish libraries in Spain were burned to the ground when the moors were driven out in the Middle ages. The Spanish civil war in the 1930s, saw thousands of churchs, monasteries, libraries, colleges and university bombed, sacked and burned by one side or the other, destroying irreplaceable documents and manuscripts. Both WWI and WWII saw great damage done in Western Europe and in Germany through the bombings, fighting and burning that occurred there. The Declaration of cities as "Open Cities" such as occurred with Rome, Vienna, and Paris, saved many treasures and documents. But other cities were burned to the ground and most of the ancient records and documents were burned. Warsaw, Dresden, Berlin Come to mind.
So, researchers have to accept those realities of fate, and not be surprised if writings on some subjects no longer exist. The reliance ONLY on written records is a peculiarly Western Concept, as reflected by our reference to Pre-Columbian "history " of the western hemisphere, as if the writings of the Mayans and Incans don't count.
We historians talk of Pre-history as if there was no intelligent way to communicate thought, or teach concepts from one generation to another before writing and paper were invented. For some reason, we seemed unwilling to allow common sense solve these questions concerning ancient tools, and practices. More is the shame. :nono: :shocked2: :hmm: :thumbsup: