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Joined: Feb 2003
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Sidelock
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I don't seem to be able to find commonly referred to label names for the major gauges vs. constriction in thousandths, just for the major gauges. As an example--.029" in a 16 might be considered full or very full? thank you. Gil


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Good question. How about what the numerical choke equates to also. ie 4, 10 on a 16 gauge.


Tom C

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Sidelock
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This is the best on line chart

http://www.hallowellco.com/choke_chart.htm

Boats

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Thanks Boats for this link. I have often wondered about the same question that was asked and am now glad I have found the definitive answer!! I am printing this page in the link as soon as this is typed. Thanks again. I never have to wonder about this site bringing us needed information!!


Perry M. Kissam
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Thank you Boats. That is exactly what I was looking for. Gil


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Yes, a big thanks for the chart.

It nicely shows that there are no hard-set rules or formulas for arriving at a certain particular pattern density.

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A couple of things worthy of note I think. One the American designation of Skeet is the same constriction as the English call ImpCyl. Two the American ImpCyl = the English quarter () choke.
Also, one question. Has anyone ever seen a factory barrel marked "Extra Full"?
In around 65 years of fooling with shotguns, I cannot recall ever seeing one so marked. I know that some at least of the Poly Chokes had an Extra Full setting & can't recall for sure if the Cutts had an extra full tube or not, but have never seen an original barrel marked other than Full, except of course the more open chokes.


Miller/TN
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You are welcome , think I first found that site on this forum

Boats

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The problem with the various charts is that different manufacturers--even in the same country (USA, for example) have used different constrictions as their standard for a given choke in a given gauge. And in some cases, those constrictions differ significantly. Jack O'Connor provides a chart of the standard constrictions used by Browning, Remington, and Winchester. 12ga modified, for example:
Browning: .024
Remington: .018
Winchester: .016

Those who've measured chokes on Belgian Brownings have usually found that they're almost always on the tight side based on what the choke marking tells you.

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Here are the barrel specs from Ithaca Gun Co. --


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