I only wipe the bore when the last load I rammed down shows signs of becoming difficult.
Yes, the super duper target shooters wipe their bore every shot but they're looking for every advantage they can have (real or imagined).
I differ with some on the idea of plugging the vent hole too.
With the vent directly in the side of the barrel, I don't see a problem with plugging the vent if that makes people happy.
With the many TC, Lyman and Tradition guns that have a small hole that connects the bore with the vent, I do see a problem with plugging the vent while loading.
When the main powder charge gets dumped down the bore, it somewhat compacts itself at the breech.
This is the same as the "drop tubes" that the BP cartridge shooters do.
Note, When this happens, little or no powder will find its way into the small connecting flame channel hole that connects the bore with the vent.
If the vent hole is left open, when the patched ball or bullet is rammed down the bore the air under it needs to escape.
If it escapes rapidly thru the unplugged vent hole, it will blow a goodly portion of the main charge along with it to end up at the vent hole.
In this position, it is right where it needs to be to pick up the flash of the priming powder.
If the vent hole is plugged while ramming the patched ball or bullet some of the air will escape past the patch or the bullet while a small amount of it will escape thru the vent hole.
A small amount of air won't blow much if any powder down thru the flame channel hole to the vents location.
If the shooter is lucky, there might be enough to pick up the prime's flash but if almost no powder is in the area it will result in a flash in the pan.
This isn't true with just the flintlocks.
A lot of the percussion shooters who have these powder chamber (patent) breech designs have found the same thing to be true.
If they leave the hammer down or a spent cap on the nipple (effectively plugging the escape path for the air), little if any powder gets blown back thru the flame channel to the bottom of the nipple so misfires will be common to those guns too.
At least that's my story and I'm sticking to it. :grin: