"They dont state in the book very clearly. Says can not exceed twice the bore diameter so to me i would take that as a land to land measurement to get the actual bore size! "


You may be right. And they may not even look at the gun. All they have to do is measure the bullet. If you are shooting bullets that are .452 in width, then they could be .904 in diameter, etc. And anyone who would give you a ticket for 4 hundreths of an inch anyway.............