Timing is everything, as they say.
One of the key functions of a hammerless double is to retract the firing pins/tumblers in the first few degrees of cocking arc/movement of opening. Some designs do this better and faster than others. Those that don't tend to leave a drag mark on the fired primers. Especially primers with soft caps.
One gun design that is very efficient in this fast cocking action is the classic Anson & Deeley.
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