I think high primers are you're most likely culprit.../ especially if the cyclinder is rotating properly when the gun is empty.
If the primers all look good ...then I think you'll have to have someone local look at the gun - but I wouldn't send it anywhere....I'd try to find someone locally ....that could look at the cyclinder hand in the action - and a number of pins - and springs in the action.
But in the meantime ....make sure the gun is clean and lubed properly.
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