I take it all the Turbo actions must have a left port for the bench rest folks. Odd to see it on a repeater. Beautiful looking gun. Is the purpose of the counter bore just to protect the muzzle?
BTW, your rear top ring piece is reversed in the photo. Kelbly machines those things to crazy high tolerances. I have never had another set of rings fit a tube as perfectly as the Kelbly rings do. They are odd looking but really precisely made.