On revolvers, there is no such thing as catching the link so the trigger is more like rowing the boat--fully back and forth.Maybe it wasn’t 20 but I’d say at least 10. I didn’t count the misfires. Maybe I was short releasing the trigger as I come from good 1911 background
Next time you have a misfire, stop, and open the cylinder and look from any primer indentation. You can also get some cheap feeler gages at the local auto supply store (these are useful for revolvers in general) and determine your headspace at the rear and the cylinder gap (distance between front of the cylinder and barrel).
If you are getting light strikes on the primer, then either your headspace is too long or your firing pin protrusion when firing is too short. The feeler gages will tell the story which is which.