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16ga.
PostPosted: Thu Aug 03, 2006 1:55 pm  Reply with quote
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I have re-posted a revdocdrew thread with a discussion of choke constrictions as an Announcement so it would remain easy to find. The original thread remains on the list.--16ga.

revdocdrew
Posted: 19 Apr 2006 10:24 am
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Location: Glendale, AZ
Two helpful charts available (of course the Hallowell chart doesn't include 16g. )

http://www.hallowellco.com/choke_chart.htm
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woodcock
Posted: 20 Apr 2006 09:32 am
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Joined: 28 Oct 2005
Posts: 112
Location: Louisiana
Don't know how useful (or interesting) this information will be but thought I'd pass it along--can't remember just exactly where I copied this chart but I'll try to locate the reference. The complete chart includes 12's and 20's BUT this IS a 16ga. site so----------------

Browning Remington Winchester
BD-.665 BD-.673 BD-.664

Full Choke .628 (.037) .640 (.033) .633 (.031)

Modified .640 (.025) .656 (.017) .648 (.016)

Imp. Cyl. .649 (.016) .665 (.008) .657 (.007)
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hoashooter
Posted: 20 Apr 2006 06:41 pm
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Joined: 08 Nov 2005
Posts: 468
Location: Illinois
Chokes and charts----there are two never ending subjects--hows come the makers can't agree on a standard---a real standard among themselves
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nossman
Posted: 21 Apr 2006 05:11 pm
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Joined: 01 Dec 2005
Posts: 68
Location: Sacramento, CA.
Colonial Arms has a nice chart (non-back bored barrels).
http://www.colonialarms.com/chokespecs.html
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Larry Brown
Posted: 21 Apr 2006 05:16 pm
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Joined: 26 Apr 2005
Posts: 434

Woodcock, your chart comes out of Jack O'Connor's "Shotgun Book". Sure shows some differences, especially between Browning and the other two. Especially on older Brownings, of all gauges, their chokes tended to be tighter than anyone else's.
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HIGH$TRAP
Posted: 29 Apr 2006 03:49 am
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Joined: 21 Feb 2006
Posts: 3
Location: PA Dutch Country
Another site, scroll down for charts.
http://www.shotguncombogauge.com/multiboregauge.html
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Dave M.
Posted: 29 Apr 2006 04:29 am
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Joined: 27 Jun 2005
Posts: 198
Location: Michigan
High$Trap, Do you have one of those bore gauges?
If you do, how do you like it.
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HIGH$TRAP
Posted: 29 Apr 2006 04:24 pm
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Joined: 21 Feb 2006
Posts: 3
Location: PA Dutch Country
No sorry, I have never used one. I use a gauge very similar to the Boremaster in my everyday work so I think it would work very well.
I just think it's a little salty price wise for all the more a guy would use it.
I keep tryng to find a choke mic cheap on Ebay.
Hope the charts are usefull though.
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fred lauer
Posted: 30 Apr 2006 08:01 pm
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Joined: 02 Feb 2006
Posts: 32
Location: western pa
A telescoping gauge and an 0-1 mic are fairly inexpensive ( you can get them on Ebay) and accuratly measure bore diameters. Numbers and charts are always fun to study but the old pattern board is what really tells the tale.
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OldM12-16gaMan
Posted: 01 May 2006 05:43 am
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Joined: 02 Jan 2006
Posts: 14
Location: Spencer IA
I have a Stan Baker bore gauage I bought at a gun show for 50.00 and it works great.Brownell has them in there catolog for around 400.00. It has information sheet that tell choke chamerber bore for all gauages. I was trying to post the info but could not figuer out how to do it

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budrichard
Posted: 01 May 2006 07:46 am
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Joined: 31 Oct 2005
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I use a Galazan Pro Bore gauge along with Galazan chamber gauge set. I have seen so many shotguns with altered chokes and chambers that I would never consider purchasing a shotgun unless I had measured the restrictions and chambers. A little money spent considering the cost of a good shotgun. -Dick
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revdocdrew
Posted: 22 Jul 2006 12:44 pm
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Joined: 28 Dec 2005
Posts: 675
Location: Glendale, AZ
Thread updated
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mike orlen
Posted: 23 Jul 2006 05:55 am

Joined: 23 Jul 2006
Posts: 1
Location: massachusetts

kgb
Posted: 23 Jul 2006 03:36 pm

Joined: 31 Aug 2005
Posts: 51
Location: Nebraska
Agree with Dick. I've encountered several guns with altered barrels although in only one case did it alter my decision to purchase. Helps to know what the manufacturers decided were proper constrictions for their markings, and brings a little more meaning to the patterning work. Which, as Fred states, is required to know what's going on out there where the pellets hit.

kgb
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16gaugeguy
Posted: 24 Jul 2006 04:54 am
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Joined: 12 Mar 2005
Posts: 1507
Location: massachusetts
Welcome aboard Mike. I'm certain your knowledge and expertise will be a most welcomed addition to the site. 16gg.

thunderstick
Posted: 24 Jul 2006 07:36 pm

Joined: 23 Jun 2005
Posts: 8
Location: Boulder,Colorado
Am I reading these charts correctly ? For instance, if a std. bore 16 ga. is .667, then do I subtract the chart decimal number to determine what the muzzle bore should read for the particular choke? Thanks for the help !
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Ron Overberg
Posted: 24 Jul 2006 09:34 pm

Joined: 02 Dec 2005
Posts: 53
Location: Plains, MT.
thunderstick,
The bore diameter of any gage would reflect a cylinder choke at the end of the tube or no constriction. With that point as the base line any constriction to the bore would make the constriction a minus from the bore diameter. Not being a machinist I still have fun reading gauges used for shotgun barrels.
Best,
Ron
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revdocdrew
PostPosted: Fri Feb 08, 2008 12:17 pm  Reply with quote
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From L.C. Smith "The Legend Lives" by John Houchins
Standard LC 16 g dimensions post-1936 when the bore was enlarged from .650"

Bore - .662"
IC - .657" or .005 constriction
Mod - .639" or .023 (Standard 16g modified choke is .013-.015)
Full - .629" or .033
16g LC constrictions as tight as .045 have been reported however Shocked

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revdocdrew
PostPosted: Thu Feb 21, 2008 8:15 pm  Reply with quote
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Courtesy of chorizo

The following is a generally agreed upon list of 16 ga shotgun TRUE BORE DIAMETERS (NON-BACKBORED BARRELS) and a listing of generally accepted choke constrictions (IN THOUSANDS OF AN INCH) noted prior to the choke diameter.
Gauge 16
True Bore Dia. .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


Also please note that variances of .002 (I have been told) are not uncommon as it is difficult to bore to exact measurements.

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revdocdrew
PostPosted: Tue Jul 08, 2008 6:55 am  Reply with quote
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Courtesy of Citori_16

16 gauge Invector barrels measure 0.667" =/-0.0015"

Full = 0.624" or 0.043" constriction
Imp. Mod. = 0.643" or 0.024"constriction
Mod. = 0.657 or 0.010" constriction
Imp. Cyl. = 0.661" or 0.006" constriction
Skeet = 0.665" or 0.002" constriction
Cyl. = 0.673" or +0.006"


Last edited by revdocdrew on Fri Nov 06, 2009 4:53 pm; edited 1 time in total

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Rrusse11
PostPosted: Sun Nov 30, 2008 7:49 pm  Reply with quote



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Gents, courtesy of Colonial Arms.

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revdocdrew
PostPosted: Fri Nov 06, 2009 4:51 pm  Reply with quote
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Another helpful all gauge chart similar to Colonial's

http://www.glencovesportsshop.com/choke.htm

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revdocdrew
PostPosted: Sat Feb 27, 2010 8:04 am  Reply with quote
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Another nice chart. Please note that the shot counts are for British shot.

http://www.suburbanguns.co.za/shooters_information.htm

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bluskies
PostPosted: Thu Aug 12, 2010 6:02 pm  Reply with quote
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I'm a new member and have a couple of questions I hope somebody can help me with. I have a remington 1100 2 3/4 in with screw in chokes. (Ugly son of a gun) I want to use it for duck and goose hunting in Arkansas this year. Are the chokes that came with the gun OK for non-tox? If not where and what choke tubes do I need. Also I need advise on non-tox duck and goose loads, (I would rather not use use steel) and where I can get it. Thanks Cool

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big-k
PostPosted: Sat Dec 18, 2010 6:44 am  Reply with quote



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What a can of worms....shotguns by nature are as verible as the weather! Do not get cought up in the specs....Remember this....Every change in shell being fired will also change the patern, Match shell with choke to get what you think you want from your paterns. Do your best to match the task at hand with the proper choke, shot size, velosity of shells being used. Tweek the combanation in use if need be to improve patern or penatration ect. Modified choke for example can be made to shoot like IC or full just by ajusting ammo specs. Particularly wads....If anyone has a gun that is open choke and wants to make it shoot like mod/imp mod buy some Noble sport hunting loads. I have tested them and cut them apart and found the wad has no slits and hold the fired shot charge together mutch longer thus giving tight paterns...thanks all SXS ohio....keep it fun!

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Baden Powell
PostPosted: Fri Dec 16, 2011 3:25 pm  Reply with quote
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Bore on my Stevens 520/Wards Western Field Model 30 is .628.
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