As Dean says
Choke is based on a percentage of the shot in a 30” circle at 40 yards (except for .410 I think)
Pick a pellet size and load. Count the pellets in that load and then fire a few at a pattern board - count the holes in the circle and average it out
BTW. Different pellet sizes may pattern a just a little different in the same gun. So go with the load you will use
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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