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#604404 10/09/21 03:27 PM
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I am trying to get s better understanding of the process of creating choke in a new barrel. Not that I will ever have the skill, machinery or need to do it but I would just like to find out more about the process. Thanks! Gil


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eeb Online Content
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Are you talking about “jug” choking a barrel?

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Gil and anybody else: Send me an email drewhausemd@yahoo.com and I'll send you "Making Double Shotgun Barrels" by A.P. Curtis in the November 1937 American Rifleman

Please let us know if you figure out how the fellas at Meriden Firearms did this with the "choke bored on the taper system"!! wink
1908 Sears, Roebuck & Co., Chicago, Ill. Catalogue No. 117:
"Shooting qualities- As before explained, the shooting qualities of these guns are unequaled for long distance killing, long range shooting, for penetration, pattern or target. Both barrels are full choke bore, so firmly constructed that unlike other guns, there is no recoil or kicking. That which in other guns goes into recoil in the A J Aubrey gun goes to give greater force to the shot."

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And now we know why the Sears & Sawbuck catalog was so popular in outhouses. It was already full of it ;-)


Caution: Hunting and fishing stories told here. Protective footgear may be required.
eeb #604421 10/09/21 08:55 PM
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No,eeb.

Last edited by gil russell; 10/10/21 07:37 AM.

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Ever read a Herter's catalog? If fish knew that you had their "special" lures they would jump into the boat to save you time and so they could get a better look at the lures in your tackle box. Hype drew interest and kids of all ages loved the hype.

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In the science of fluid flow it is well known that a constriction in the flow channel will cause an increase in velocity of the fluid and a decrease in pressure. Constant mass flow rate requires that the flow go faster in a smaller area. Velocity times pressure is a constant, so increased velocity requires reduced pressure.

A simple conical constriction is completely satisfactory for choking lead shot. Conical is an easy shape for a reamer. The barrel is bored so as to leave a little extra "meat" in the choke area. The reamer guides off the bore. There are myriad "secret/magic" reamer profiles. After reaming, the whole "she-bang" is lapped and polished.

DDA

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Say it ain't so Don - 'ya mean there is no magic!?! wink

What about the Herb Orre choke?

[Linked Image from photos.smugmug.com]

And the "Multiplied Choke Bore System"?
https://members.boardhost.com/lcsmith/msg/1624920858.html

Gough Thomas, Shotguns & Cartridges For Game And Clays, 1970
"Occasionally, a clay pigeon shooter's outstanding success at some major international competition will be attributed by him or others to some marvellous new system of boring. This is a subject that is in every way likely to involve elements that have nothing to do with practical ballistics; and in view of the fact that every conceivable variation in the boring of shotguns - every possible combination of features - appears to have been tried, one is entitled to treat any such accounts with reserve.”

Previous choke length thread
http://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=466257

Another resource "Making Shotgun Barrels" by Harold Hoffman
https://archive.org/details/Making_Shotgun_Barrels_By_Harold_Hoffman_Action_Book_Publishers/page/n1

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The conical-parallel is more common than plain conical chokes.

One simply makes a tube, then mills or grinds away anything that doesn't look like a choke.

There are swaged chokes too. The barrel is driven into die.


"The price of good shotgunnery is constant practice" - Fred Kimble
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Possibly of interest
“Experiments With (the length) Of A Choke Bore”
Forest & Stream, January 28, 1905 originally published by The Field (London)
https://books.google.com/books?id=6JbaHddByIUC&pg=PA84
A choke constriction of .016” and choke length of 3/4”, 1/2”, 1/4” and 1/8” produced essentially the same pattern percentage.

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