Thanks again, I talked to the gunsmith this afternoon. The bore diameter stamp is 15.9. That converts to .626 inches, a little closer. He is going to calibrate his gauge and read it agian.
Other stamps are CAM .70 and HE 1.200 . I was on a cell phone in a poor service area, I'll try to get more info later.
I usually use the choke chart on Hallowell's site. It shows 20g, .005-.011 IMP and .012-.019 MOD
terc
Hallowell is the only one that uses a spread like .005 to .011???? The only thing I can figure is they are talking about an IC choke giving an IC size pattern at a given yardage. I know I have been surprised when patterning guns giving much smaller or larger patterns than they should have, given the restriction. I am convinced how the choke is configured has a lot to do with the size pattern it may give.
