You have to do it again. In the late 1800's Webley-Fosbery made an automatic cocking revolver in .455 caliber, but it didn't catch on.
Sounds like you might benefit from a basic firearms course at a local range, gun club, or gun shop. Modern revolvers do not need to be cocked, and in most training institutes, cocking is not recommended. Older designs, such as cowboy guns, did require cocking.
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