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Old February 17, 2000, 11:07 AM   #1
muleshoe
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Join Date: January 3, 2000
Location: Mills County, IA
Posts: 410
Just wonderin. Does anyone have the ID measurements for all chokes and including the ID of a 12ga.? Maybe post measurements for 20 ga. also if you're feeling energetic. I'm curious as to which is the closest to a straight bore.

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bullet placement is gun control
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Old February 17, 2000, 01:01 PM   #2
jcoyoung
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Join Date: January 20, 2000
Location: Oak Forest, IL
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From my understanding, the Cylinder choke is the same as a straight bore.

Chokes are also more than just a change in ID. Some chokes will just taper down (conical), some will step down (beginning and end of choke cylindrical, middle part is conical). There may be other choke geometry I can't recall at this time.

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"Ray guns don't vaporize Zorbonians, Zorbonians vaporize Zorbonians" The Far Side
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Old February 18, 2000, 12:34 AM   #3
jcoyoung
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Join Date: January 20, 2000
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OK Muleshoe, I dragged out my Gun Digest Book of Trap & Skeet Shooting, so get ready to highlight and hit <ctrl>-V.

American Standard Bore & Choke Dimensions
____________12 GA_____20 GA
Bore ID______.729______.617
Full_________.035______.025
Imp Mod_____.025______.019
Mod_________.019______.014
SK2_________.012______.009
Imp Cyl______.009______.006
SK1_________.005______.004
Cyl_________.000______.000
(there is also data for 10,16,28, and 410), but I'm not THAT energetic.

The choke dimensions are choke constrictions. (Change in diameter?)

Now, choke styles:
Cone plus parallel (most consistent and even patterns)
Cone
Cylinder
Spreader


WHew, I have got just TOO much time on my hands.

Jason


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"Ray guns don't vaporize Zorbonians, Zorbonians vaporize Zorbonians" The Far Side

[This message has been edited by jcoyoung (edited February 18, 2000).]

[This message has been edited by jcoyoung (edited February 18, 2000).]
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Old February 19, 2000, 11:31 AM   #4
huntschool
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Muleshoe:

all of the above #'s from joy...... work well but the ID goes out the window if the bbl has been back bored and Beretta as an example runs slighly tighter ID on a stock bbl. Browning, in their comp guns tends to run just a hair over.
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