From the earliest Parker Catalogs/Price Lists to 1904, Parker recommended 1 1/8 oz loads for 12ga guns and not dependent on the weight of the gun.
In the 1926 catalog it states, "We target all guns on 30-in circle, 40 yds. with proper loads for the gauge of the gun, using standard factory loads."
Also in the 1926 or 1927 catalog, Parker lists standard 12 gauge shotgun loads. Depending on the birds being shot, the largest weight of shot recommended was for large geese using 1 1/4 oz of shot, most other birds were using 1 1/8 oz and a few were recommended at 1 oz of shot.
Just a guess but unless the buyer specified a certain size shot, powder, and or shot weight, they used 1 1/8 oz of shot for patterning.
Interesting that the D lifter I just bought, the buyer wanted the gun targeted with #6 shot. The stock book shows they used #8. Interesting!
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