I remove the screw and use an alcohol dampened Q-Tip to clean the channel and powder chamber. After allowing things to dry, I hand start the screw back and load the gun. Before I cap it, I use a 2 grain flint primer horn to drop two grains of primer into the channel and put the screw in. Pick the nipple and cap. If you want to get technical, you can use a nocking pliers to fit the cap tightly to the nipple and a touch of wax to seal things.
When I am in a place where popping a few caps makes no difference, I pop caps on the gun the night before. One to see if it will move grass or leaves at the end of the barrel. The second with a piece of paper towel rammed all the way on the rod. If the channel is clear, a round scorched area will appear on the paper towel. Then I clean the channel as I described above.
I hunt with CVA's. I fire them into the unloading stump in the evening and completely clean them before I feed myself. The only time I leave a load in a gun is when I am somewhere that an unloading shot isn't a good option.
You can clean the channel, use a prime, and get by without popping caps at all if you need to. You can remove the screw, clean the channel with a small brass wood screw to remove the old powder, and re-prime during a hunt if the gun needs to be left loaded. If you use a CVA/Jukar/Tradition's type breach, leaving the gun loaded for long periods is not wise without doing this re-prime action. The powder channel is about the size of a 22 bullet, and four threads dead end into the sides of the channel. There is also a groove at the end of the drum that makes a place for oil to collect. You can clean them till the cows come home, but if you put anything liquid down the barrel, it will end up in those threads and in that groove at the end of the drum threads. When you put dry powder in there, the oil begins to wick into it out of those threads and the groove acts as a tank to hold the supply. Storing the guns standing on the muzzle with a dry paper towel patch helps to get some of it out. These guns should never have anything liquid put into the breach area that will not rapidly evaporate back out. I know that sounds crazy, and I used oil and bucket cleaning for years myself. I figured this out recently myself when I removed the drums from several CVA barrels after finding the problem in the first one. They all had the same problem. Lots of oil in the threads, groove, and collected at the end of the drum in the plug. I have yet to find one that did not show the same problem. The powder channel and drum channel need to be cleaned manually and the guns protected with something that will not infliltrate the powder in the channel at the ends of the screw threads. That is if you want the best most dependable gun that they can be. Since this is still pretty new to me also, I have not completely figured how to handle the problem. My hunting guns no longer get anything liquid in them except alcohol and the oil has been removed from breach areas.
Have a beautiful day!