speaking of measuring shotgun chokes

varian

January 21, 2021 17:23

arent shotgun chokes based on the difference from the bore size to the amount of constriction provided by the choke. you can sort of prove this by measuring the same marked {say full} choke from different manufactures, in my experience is they vary by quite a bit, as do bore sizes. so you can buy a $200.00 set of calipers or a $20.00 set, but unless you know what the factory spec is all you can do is make your best guess and go from there. of course the only true way of knowing is to pattern your gun with every shot size and brand of shell you plan on shooting.

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  BobJudy

  January 21, 2021 18:31

  Chokes seem to be a magical art as two guns with the same choke can shoot different patterns using the same load. That being said when measuring a choke two measurements need to be obtained, normal barrel diameter and the choke diameter. The difference of th two is obviously the amount of choke.

  This explains it better than I can

  Choke (firearms) - Wikipedia
  In firearms, a choke is a tapered constriction of a gun barrel at the muzzle end. Chokes are most commonly seen on shotguns, but are also used on some rifles, pistols, or even airguns.[1] Notably, some .22 LR match rifles have a constricted bore diameter near the muzzle.[citation needed]

  To complicate things modern shells with a plastic shot cup perform differently than the old shells without any protection for the shot column as it goes down the barrel. I have seen older guns marked modified throw a full or extra full pattern with modern ammunition. You are right patterning a shotgun is the best way to determine what works regardless of choke markings or measurements. Bob

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  XXCross

  January 21, 2021 18:59

  Bobjudy nailed it. Also to be considered is the alignment of the choke with the bore of the barrel. I've seen a lot of them that were off center. ("choke" is a percentage of restriction. aka, 10%, 5% etc)

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