This likely isn't a new idea, but for really cleaning the corners of a flat-faced breech, I've found that the combo of a felt revolver wad plus the cleaning patch helps get all the fouling out of the corners. Most brass jags are somewhat rounded, so they're not too sharp, and that can leave some junk in the corners/edges. But by putting a felt revolver wad (.45 in the image) on top of the jag, and then putting on the patch over it, the slight compression of the wad better then allows the patch to clean the breech face where it meets the barrel.
Tight groups!
Old No7
Tight groups!
Old No7
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