Francis,
Point of Aim is at shot at 16 yards. At 40 yards one can certainly determine is POA is not center.
Personally I like to shoot at clay targets to determine if a gun is producing a tight or open pattern. I have an LC Smith Grade 3 12 ga with one barrel having a constriction of .008". That should be a bit more open than IC but it is not. With my 6000 PSI 7/8 oz loads it shoot a fair bit tighter as evidenced my breaking targets consistantly at teh trap range. This could be from a "hot core" or dense center of the pattern. This is a good barrel and load to actually shoot at paper to figure out how the barrel is actually patterning.
PS: Calvin, Some old Parker 10's had bores over .800". There was a recent thread on this oun the Hammer Gun section.
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