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I had one years ago.It had a nipple that used musket caps.Anything over 60 grains,hammer would blow back to full cock
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That is a dangerous condition. The images I found did not show a musket nipple but standard rifle nipple. Someone screwed with your gun.
That rifle should take heavier charges OK.
BTW, 3Fg is just fine. Work up your charges just as you would any ml rilfe.