Bill: seems to me that choke runs can be of use without bore diameter. If a gun has 1" of choke run it seems it's more likely cut than one with 3"-4" of run. What have I missed? I figured that was why John asked for the runs. I have had only one Parker opened. A 26" F/F VH12. Couldn't see much use for a 26" gun that tight. It turned out to be a mistake but only because of WHO did it and HOW they did it. Very depressing story that is well known to some on this forum. I'll spend the rest of my days apologizing to and for that gun....

I don't have the proper bore diameter tool yet. Just a finger caliper that will reach in 3.5". It works well on chokes and chambers.