A simple phone call to us would have resolved this problem. It’s not that the cones are too tall in the cylinder. They fit 99% of the revolvers out there and provide a dramatic improvement in ignition reliability without any modification. The issue is that your revolver has way too tight of tolerance between the cylinder and the barrel. Simply remove the barrel and file off material on the forcing cone until you achieve a barrel/cylinder gap of .012” to .018” or until you can cycle the gun without it locking up. If we shortened the cone height then the majority of our nipples would be no better than the stock ones which have failure to fire problems. Not all BP revolvers adhere to the same tolerances. Tuning the guns is always a good idea anyway. Also keep in mind that the deeper the wedge is inserted the tighter the cylinder/barrel gap becomes. Another option would be to take it to a competent black powder gunsmith and have it tuned properly.
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