A barrel pollishing removes about 2 thousandths. A honing removes about 8 thousandths.
I doubt a single pit is of any significance.
Pete, in this theoretical case a barrel polishing have to remove as much as needed to remove the pitting, 0.004.
Here's a picture of the gun that has prompted my questions. It's a Sauer sidelock that has some severe exterior pitting. The bores are fine and still in proof, no pitting at all but I'd have to strike off a good bit of this area to be able to get a decent re-blue and it's right where my left fingers would rest while firing the gun.
