My Nu-Line external knurled chokes have the actual number on them as well.
Briley, Carlson, TruLock and others as shared do this.
Why?
Folks like simple and like excuses as to why they miss.
Before screw in chokes, folks blamed fixed choke barrels.
Don't forget one gets more excuses when "constriction" and shells are mixed matched and blamed.
TTBOMK The British came up with "choke". Difference is, the British understood payload to bore, and though many times the guns were "tighter" bore diameters, the shells of the day sorta dictated what worked.
11/16 oz payload from a 12 bore gun the British considered "the proper load".
1 1/8 oz was "heavy" and 1 1/4 oz was "magnum".
Silly Americans, always thinking "bigger is better" and using "heavy" and "magnum" loads.
Silly twits, back down the payload to a "proper load" [11/16 oz] and for instance "quarter choke for the driven game would much more civil".
When the British spoke of "constrictions" they were really knowledgeable about what they were speaking of.
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Back in the day, and some us still can - IC patterns from fixed Full barrel.
Today, folks want simple and they want to buy skill targets. They cannot get Full patterns out of a choke marked full .
I joked about a digital gauge one inserted into a barrel to "know the choke".
Who cares how accurate, I was thinking "Marketing" - look how well the battery operated choke changing tools sold.
Lady friend of mine said a digital read out was "old tech".
"Need to be where they use their iPod and the iPod tells them what they have for choke".
Ya know, if Apple comes out with this, remind me to show them this post.