Determining original choke constriction

[Jeff S.]

Good evening Parker experts. I could use a little help. About a year ago I bought my first Parker, a sweet little 16 ga. DH that shipped in 1910. I haven't hunted with it yet, but it sure is fun to shoot. I purchased a letter and everything looks pretty good, but I suspect that the chokes may have been opened up a little. That doesn't bother me because it shoots fine, but I do wonder what they were originally. I have measured the barrels a few times and I always get .015" inches of constriction on both barrels. According to the letter, the RH barrel should put 115 to 125 pellets in the circle and the LH barrel should put 170 pellets in the circle. Since I'm new to Parkers, I don't know what shells they used for these tests. Does anyone know the denominator for this equation? (total BB's in this particular 16 ga. shell)?