choke size

[Big Friend Ten (BFT)]

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.

[Autumn Daze]

I agree with Mark. A .785 choke diameter would have to indicate a bore larger than that assuming there is some choke in there. Some of these old 10's had quite large bore's. You really need to check your bore diameter.