October
S M T W T F S
1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30 31
Who's Online Now
2 members (SKB, John E), 1,400 guests, and 3 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums10
Topics39,519
Posts562,295
Members14,590
Most Online9,918
Jul 28th, 2025
Previous Thread
Next Thread
Print Thread
Page 2 of 2 1 2
Joined: Oct 2006
Posts: 131
Sidelock
OP Offline
Sidelock

Joined: Oct 2006
Posts: 131
Here are some measurements I've recently pulled off the Web. As you can see, they're all over the map.

16 Gauge Bore and Choke Measurements

Briley:
Standard bore measures .662”
Choke Constriction Measurement
Skeet .005” .657”
Improved Cylinder .010” .652”
Light Modified .015” .647”
Modified .020” .642”
Improved Modified .025” .637”
Lite Full .030” .632”
Full .035” .627”
Xtra Full .040” .622”

Patrick Sweeney:
Standard bore measures .667”
Cylinder .000” .667”
Skeet 1 .004” .663”
Imp Cyl. .006” .661”
Skeet 2 .010” .657”
Mod. .015” .652”
Imp. Mod. .025” .642”
Full .028” .634”

Browning:
16 gauge barrels measure .667”
Cyl. .006” .673”
Skeet .002” .665”
Imp. Cyl. .006” .661”
Mod. .010” .657”
Imp. Mod. .024” .643”
Full .043” .624”

Other:
Standard bore measures .667”
Cylinder Bore .000” .667”
Skeet I .004” .663”
Improved Cyl. .007” .660”
Skeet II .010” .657”
Modified .015” .652”
Improved Mod. .020” .647”
Full Choke .028” .639”
Extra Full .035” .632”

L.C. Smith:
Standard bore measures .662”
IC .005” .657”
Mod. .015” .647”
Full .033” .629”


The only constant in life is change.
Joined: Nov 2005
Posts: 1,274
Likes: 1
Sidelock
**
Offline
Sidelock
**

Joined: Nov 2005
Posts: 1,274
Likes: 1
I checked my 16ga sterlingworth, 30" barrels with skeets gauge

right= bore .659 choke .641

left= bore .660 choke .619

gun serial #366321

keep in mind that if a barrel didn't clean up at the desired bore diameter the factory just keep honing until it did within limits. From what I have seen Fox barrel bores usually are undersized.

Jim


I learn something every day, and a lot of times it's that what I learned the day before was wrong

Joined: Jun 2007
Posts: 247
Sidelock
*
Offline
Sidelock
*

Joined: Jun 2007
Posts: 247
Thanx for the numbers. I'll do a regression analysis and get R^2 values for each combination. Will post here if I cipher it out.

Joined: Oct 2006
Posts: 131
Sidelock
OP Offline
Sidelock

Joined: Oct 2006
Posts: 131
James:
So I'd gather, by some charts, that your gun is choked Modified and Xtra full.


The only constant in life is change.
Joined: Apr 2008
Posts: 640
Sidelock
**
Offline
Sidelock
**

Joined: Apr 2008
Posts: 640
What I have always gone by is 16ga:

bore dia US....16.89mm or .6650in(min) & 17.40mm or .6850in (max)

Chokes:
.000 - .002 cylinder
.004 - .012 imp cylinder
.016 - .024 modified
.028 - .032 imp. mod.
.036 - .039 full

this has always been a good reference for me.

tim

Joined: Nov 2005
Posts: 1,274
Likes: 1
Sidelock
**
Offline
Sidelock
**

Joined: Nov 2005
Posts: 1,274
Likes: 1
Originally Posted By: mark gruber
James:
So I'd gather, by some charts, that your gun is choked Modified and Xtra full.


Mark it would have been so in 1929 when it was made, today it is over-choked. The only real test is shoot the gun on a pattern board, this is what Parker Bros did and I would guess the other quality makers did the same. I have a page in my note book that I used years ago, it has some interesting stuff, I will scan it and post it.

Jim


I learn something every day, and a lot of times it's that what I learned the day before was wrong

Joined: Nov 2005
Posts: 1,274
Likes: 1
Sidelock
**
Offline
Sidelock
**

Joined: Nov 2005
Posts: 1,274
Likes: 1
Here is the page I mentioned above, I am not sure where the info came from, part was from a Chubb bore gauge I had at the time and some from other sources. It dates back to 60s or 70s.

Jim


Last edited by james-l; 12/19/08 06:03 PM.

I learn something every day, and a lot of times it's that what I learned the day before was wrong

Joined: Jan 2002
Posts: 11,573
Likes: 165
Sidelock
**
Offline
Sidelock
**

Joined: Jan 2002
Posts: 11,573
Likes: 165
Originally Posted By: mark gruber
So if the chokes are .025 and .038 I can assume that they are originally tight-modified and tight-full assuming that the bores have not been opened creating tighter chokes. But could they equally be .015 and .025 and still be Mod. and Full per Foxes original boring? What I'm trying to find out is what is the allowable "range" that Fox might have used in a 16 gauge.


Mark, based on the two 16ga Foxes from which I took measurements, I think it's safe for you to assume that your gun is an original M/F. I don't think Fox would have treated 015/025 as M/F on a 16, at least not from my measurements (and from those others like James have posted). And I agree with James that bore diameter on Fox 16's was quite a bit tighter than the usually accepted standard of somewhere in the 662-667 range.

Joined: Jun 2007
Posts: 247
Sidelock
*
Offline
Sidelock
*

Joined: Jun 2007
Posts: 247
NEWS FLASH
Computer worked all night analising all this data ad naseum results are in.

Computer says set up paper sheets at 40 yards and figure % of pellets in 30" circle, compare with 40% for cyliner 50 % for IC 60% mod and 70% full,..

Hey I think we arleady knew that.

Joined: Dec 2001
Posts: 6,458
Likes: 336
Sidelock
***
Offline
Sidelock
***

Joined: Dec 2001
Posts: 6,458
Likes: 336
From 16 bore DE Grade/ Bores both .660 with .005 and .015 chokes.

Page 2 of 2 1 2

Link Copied to Clipboard

doublegunshop.com home | Welcome | Sponsors & Advertisers | DoubleGun Rack | Doublegun Book Rack

Order or request info | Other Useful Information

Updated every minute of everyday!


Copyright (c) 1993 - 2024 doublegunshop.com. All rights reserved. doublegunshop.com - Bloomfield, NY 14469. USA These materials are provided by doublegunshop.com as a service to its customers and may be used for informational purposes only. doublegunshop.com assumes no responsibility for errors or omissions in these materials. THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANT-ABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. doublegunshop.com further does not warrant the accuracy or completeness of the information, text, graphics, links or other items contained within these materials. doublegunshop.com shall not be liable for any special, indirect, incidental, or consequential damages, including without limitation, lost revenues or lost profits, which may result from the use of these materials. doublegunshop.com may make changes to these materials, or to the products described therein, at any time without notice. doublegunshop.com makes no commitment to update the information contained herein. This is a public un-moderated forum participate at your own risk.

Note: The posting of Copyrighted material on this forum is prohibited without prior written consent of the Copyright holder. For specifics on Copyright Law and restrictions refer to: http://www.copyright.gov/laws/ - doublegunshop.com will not monitor nor will they be held liable for copyright violations presented on the BBS which is an open and un-moderated public forum.

Powered by UBB.threads™ PHP Forum Software 7.7.5
(Release build 20201027)
Responsive Width:

PHP: 7.0.33-0+deb9u11+hw1 Page Time: 0.196s Queries: 34 (0.161s) Memory: 0.8503 MB (Peak: 1.9018 MB) Data Comp: Off Server Time: 2025-10-17 14:02:36 UTC
Valid HTML 5 and Valid CSS