Keep in mind that some misfires are the result of not pushing the round fully into the chamber. With tight chambers you may think they are fully inserted, but often need an additional push. My "yardstick" for when a cylinder needs to be reamed is when you can't fully extract the cylinder-full with just your thumb. If you have to use two hands to empty the cylinder it isn't clean enough.

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H Richard
SWCA1967 SWHF244