Very good post!
The builder of my new Hawken rifle made cleaning tools for the patent breech before he installed it in the barrel. The cleaning jag will take a patch to the bottom of the breech and the scraper will remove fouling. I need to use a standard breech scraper to remove fouling from the shoulder of the breech and a pipe cleaner in the fire channel.
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May I have permission to use your photos of your cut breech? I would like to pass this knowledge along to others.