What's this for? Looks like a jag with a slotted screwdriver end. Is that to help clean the breach by twisting/scraping? There is also a spin jag that apparently follows the rifling. Worth messing with?
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Slotted Jag?
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If you have a gun with a patent breech, a scraper that's the bore diameter won't do much ..except scrape the shoulder of the breech. Patent breech (common on production guns like TC, CVA, etc) is better cleaned with a smaller diameter bore brush.
Breech scraper
Here’s another style
The flat one is the one. Do you twist it at the breech with a patch on it or is it just to scrape the breach without a cleaning patch?
Put a little of your favorite cleaning liquid down first, then twist a few times clockwise (no patch) and you should pull out a little bit of mushy residue. I do that a couple times, until I stop getting anything on the scraper.
Obviously, the illustration shows flint breeches. Percussion breeches are essentially the same with the drum or snail extending the length of the flash channel.
@Yewbender's flat scraper is designed for the traditional breech. It will not clean the sub bore sized chambered breech, the CVA/Traditions breech or the Nock's Patent breech unless it has been modified to fit the chamber.
The second scraper has been designed to enter the sub bore sized chambered breech. The flash channel will still have to be scoured out as well. To that end one needs a pipe cleaner to reach from the nipple seat to the powder chamber.
While I am well aware that many of the production manufacturers of percussion muzzleloading firearms will call that screw at the end of the drum or as part of the percussion snail a clean out screw. It is NOT A CLEAN OUT SCREW. It's really a plug that closes the drilling that created the flash channel. It can be used as a clean out screw, but these screws are very soft and the slot will eventually be ruined unless carefully fitted screw drivers are used and never seizing lubricant is used in the threads which have to only be tightened to snug. Note: T/C eliminated the "clean out screw" in their breeches as under their warranty policy they were regularly replacing breeches with clean out screws that had the screw slots ruined.
Bighorserider
40 Cal
TC used to make a tapered jag to fit their breech plugs. Works great. Don't know if they are still available, but if you have a TC you need one.
@Yewbender's second photo shows one of the TC scrapers. They work well, and I usually follow with a pipe cleaner through the touch hole/nipple channel -just in case the scraper pushes any fouling from the chamber into the vent.
