I'm looking at a 16 ga. double made circa 1875 that has Birmingham Proof marks. Did you do anything other than check the barrels with a borescope before shooting it?
I disassembled the entire gun and cleaned all the old residue from the lock mortises and the locks. Also insepected the barrels for any cracks or bulging and the ribs. After cleaning everything and carding the rust off the barrels with a piece of copper, I used some naval jelly with cottonballs attached to coat hangars and got the bores cleaned out.Then I used a bore brush. Got the borescope out again and rechecked the bores. Came out very clean with just some very slight pitting down by the breech, could barely see it.
I also etched the barrels some to bring out the twist pattern.I disassembled the entire gun and cleaned all the old residue from the lock mortises and the locks. Also insepected the barrels for any cracks or bulging and the ribs. After cleaning everything and carding the rust off the barrels with a piece of copper, I used some naval jelly with cottonballs attached to coat hangars and got the bores cleaned out.Then I used a bore brush. Got the borescope out again and rechecked the bores. Came out very clean with just some very slight pitting down by the breech, could barely see it.
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