I recently fired a .45 Kentucky rifle (kit gun) with a weak main spring, or possibly an altered nipple, and it was not a good thing - grains of BP blew into my face.
I only fired it once and gave it back to the owner without really investigating.
Ejecting a spent cap might work better on a side hammer gun (Allen & Wheelock). There certainly is alot of unused power in the blowback.
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