If you send about 50 rounds down range and don’t clean until a few days, or few weeks later is there anything that could corrode the internal parts?
Likewise if you sent any number of rounds through it.
Always when shooting my black powder rifles. Clean with hot soapy water, then a few patches with just hot water, dry and oil or grease. I have an old 1869 Swiss Vetterli that has one of the best looking barrels of any gun I have seen, including new and unfired. It has a shine that simply does not quit, no pits or frosting, just perfect. It apparently has been extremely well cared for over it's 149 years. The cartridge cases also get washed, rinsed and dried.