I pop a cap every time before loading after cleaning my ML’s, oiling and putting them away. Sometimes the cap does not sound very strong, therefore I pop a second one, which is always louder. That tells me all I needed to know. However, after wiping the bore prior to loading, I shoot a little bit of lacquer thinner down the flash channel then follow up with compressed air.
I never have a misfire, not even after hunting in the rain for several hours. This is a very humid Area. I use Ballistol liberally. Wiping the bore, lacquer thinner, compressed air and snapping a cap pays off.
Indeed, I go through more caps than many using this process but I simply do not experience misfires nor hang fires. Considering I squirrel hunt a lot, which most times I shoot at least 3-6 times each hunt, I reckon I go through 150 caps a year in my squirrel rifle just for that alone. That does not include testing and other ML’s.