The volume inside the can available to slow down the gas is reduced when it's dirty, and .22 cans don't have a lot of volume to start with. The dry particulate lead and carbon doesn't serve a useful sound deadening purpose such as the baffles or a wet medium would. That's why it gets louder when filthy.
FWIW, I went with a S/S takedown SWR Spectre for my first can.
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