OregonHunter5

Pull the breech plug and drop in some hot soapy water and let it soak. You may need to use a small twist dril to clean the 'flash channel' the fire channel directly under the prime to the flash hole. Turn the drill by hand, if there is a build up of carbon you will feel it as you twist it out.

You can visually inpect the 'flash hole' to see if it is open + plus you could by one of those handi-dandy little tip cleaner tools for welding and one of the tips will fit that small hole if you think it is necessary.

If you are using a 'hot' primer like the Fed 209A it will tend to plug the 'flash channel' after awhile. The burnt t7 residue will soak off with the water...