Shot gun barrel are not "regulated" like rifle barrels. When they are built the muzzel ends are brrought together to be parralel and in such a way that the boers are straight and not bowed in or out. Thats the way the gun has developed over the last century or so .On a side by side at 30 yards, the right barrel will generaly shoot to the left and a little high of the "target" if you were to aim it like a rifle ,the left barrel will do the oppersit. An O/U will generaly shoot top barrel flat and bottom high ,Hence a high ribb to average it out.
You can work this out mathmaticaly so its no secret.
I do not understand what people are talking about with comments about reglation as to do what is suggested would make your barrels look awful ,and pray tell me how do you do this to barrels that have braised ribs?
May be some of these experts would like to explain exactly what it is they do.
I spent 9 years building new guns and I never once heard this mentioned . I have been sleeving guns for 30 years and agian never had any request or instruction to do this. So to my original comment, let me rephrase it , A shot gun will shoot to a specific place, not nessesarly the point it is "aimed" at. A shooter with a well fitting gun will be able to shoot to that same place consistantly. It is down to his ability to put that place in the correct place to hit his target.
