I always thought a choke determination in most of those records was based on how many pellets of certain shot size and load amount would hit in a circle at a specific yardage. They would test fire and then would count the result and labels gun choke in records and even put the results with a tag of the gun. I think this could result in inconsistent vagaries. I think the modern methodology we more heavily rely on now looks at the constriction measurements. Obviously there could be some deviation and the original process could have a lot of inconsistencies but if gun performed within an accepted standard of deviation then it was labeled a certain way.
It could be interesting if you had the actual test results of gun that came out factory labeled as such and then reapply the same method today see if there is a big difference. Lots of variable could change results, like shot deformation. Lots factors to consider even the use of a modern shot cup.
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