Personally, I do not believe that straight edge bit is totally reliable. Many doubles, particularly relatively lightweight ones have their OD's increased in the choke area so they are a bit "Swamped". Also even if proved to be perfectly straight there is still the matter of did they get set to the absolutely correct convergence, which of course can vary a bit according to load used.
Both barrels are very straight with no choke bulge. Whether it is the choke tube threads, barrel convergence or a poorly formed choke tube is unknown by me at this point. The weather, the holiday coming and the fact that I live in NJ with the closest patterning board I know of about two hours from here ( a sporting clay club I shoot at in Pennsylvania) makes this difficult and time consuming.
I usually shoot Herters Low Recoil shells so that is what I pattern with. One ounce at 1060fps. As an aside, they work very well even at far targets.
