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I've never done it either, but it's kinda like valve lapping. Just helps knock down the tiny burrs and gets a better seal.Seems like a strange idea to me to deliberately wear down your rifling with high speed sandpaper
It doesn't 'wear down' the rifling as much as you might expect.Seems like a strange idea to me to deliberately wear down your rifling with high speed sandpaper
I was thinking for a new barrel I have. You can see a little burr here and there with the bore scope. The lands are not mirror finish either.It doesn't 'wear down' the rifling as much as you might expect.
It's more of a way to preserve the the rifling that exists - as well as to 'clean up' any old powder fouling, rust etc. that might exist.
It's not perfect but it helps.