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Forums10
Topics39,519
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Jul 28th, 2025
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Joined: Oct 2006
Posts: 131
Sidelock
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OP
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 .662β
Choke Constriction Measurement
Skeet .005β .657β
Improved Cylinder .010β .652β
Light Modified .015β .647β
Modified .020β .642β
Improved Modified .025β .637β
Lite Full .030β .632β
Full .035β .627β
Xtra Full .040β .622β
Patrick Sweeney:
Standard bore measures .667β
Cylinder .000β .667β
Skeet 1 .004β .663β
Imp Cyl. .006β .661β
Skeet 2 .010β .657β
Mod. .015β .652β
Imp. Mod. .025β .642β
Full .028β .634β
Browning:
16 gauge barrels measure .667β
Cyl. .006β .673β
Skeet .002β .665β
Imp. Cyl. .006β .661β
Mod. .010β .657β
Imp. Mod. .024β .643β
Full .043β .624β
Other:
Standard bore measures .667β
Cylinder Bore .000β .667β
Skeet I .004β .663β
Improved Cyl. .007β .660β
Skeet II .010β .657β
Modified .015β .652β
Improved Mod. .020β .647β
Full Choke .028β .639β
Extra Full .035β .632β
L.C. Smith:
Standard bore measures .662β
IC .005β .657β
Mod. .015β .647β
Full .033β .629β
The only constant in life is change.
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Joined: Nov 2005
Posts: 1,274 Likes: 1
Sidelock
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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
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Joined: Jun 2007
Posts: 247
Sidelock
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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.
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Joined: Oct 2006
Posts: 131
Sidelock
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OP
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.
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Joined: Apr 2008
Posts: 640
Sidelock
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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
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Joined: Nov 2005
Posts: 1,274 Likes: 1
Sidelock
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Sidelock
Joined: Nov 2005
Posts: 1,274 Likes: 1 |
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
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Joined: Nov 2005
Posts: 1,274 Likes: 1
Sidelock
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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
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Joined: Jan 2002
Posts: 11,573 Likes: 165
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 11,573 Likes: 165 |
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.
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Joined: Jun 2007
Posts: 247
Sidelock
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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.
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Joined: Dec 2001
Posts: 6,458 Likes: 337
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 6,458 Likes: 337 |
From 16 bore DE Grade/ Bores both .660 with .005 and .015 chokes.
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