Francis is correct.
Choke is measured by the percentage of shot inside a given circle at a given distance such as 50% of all shot hitting within a 30" circle at 40 yards.
What 99% of all shotgunners refer to as choke, i.e. skeet, is actually the physical constriction such as .005" that may likely cause the effect of a percentage of pattern listed for a skeet choke.
For those who are not shotgun crazy, as we are, the naming rather than numerical designations is easier to comprehend and remember.
Mark
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