Upon prepping for my range trip today I did the usual by running a range rod with jagged tip down the bore so I could check for "unloaded" and also mark the rod for that unloaded length. Except today when I did that, instead of the range rod going "clank" upon hitting the breech face, it went "thump". Thought to myself "that's not rignt". It went in what seemed to be proper depth, but it felt "spongy", and it didn't make the right noise upon hitting the breech face. Looking down the bore with a flashlight, I could see nothing. The breech face appeared light, except maybe not as "shiny" as I'd expect.
So, I replaced the jag with a worm, went in with the rod and screwed well down, and then pulled out what appeared to be a compacted remnant of a cleaning patch. I usually double up my patches so as to "dig into" the rifling, and apparently one patch got loose from the jag and stayed down against the breech face, probably to be additionally compressed by any subsequent bore strokes. If a patch is compressed up against the breech face, you can't really tell by looking down the bore with a flashlight. You can see black powder fouling, but you can't see something that's basically the same color as the breech face.
Lesson learned: check for proper depth AND proper "clank" after cleaning as well as before shooting.
So, I replaced the jag with a worm, went in with the rod and screwed well down, and then pulled out what appeared to be a compacted remnant of a cleaning patch. I usually double up my patches so as to "dig into" the rifling, and apparently one patch got loose from the jag and stayed down against the breech face, probably to be additionally compressed by any subsequent bore strokes. If a patch is compressed up against the breech face, you can't really tell by looking down the bore with a flashlight. You can see black powder fouling, but you can't see something that's basically the same color as the breech face.
Lesson learned: check for proper depth AND proper "clank" after cleaning as well as before shooting.
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