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Joined: Mar 2009
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Sidelock
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Sidelock
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Interesting gun, though the wall thickness would make it a wall hanger for me
Michael Dittamo
Topeka, KS
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Sidelock
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Sidelock
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The reproof was 1954 - 1989. IF the original L barrel was '13' like the R that would be .710" - .718". When reproved the L barrel was .740" which is substantial honing. The arrow is the date of proof code which I can't read. ![[Linked Image from photos.smugmug.com]](https://photos.smugmug.com/Proof-Marks/i-ZMLMH59/0/Kw8j8xcvXCFdMdJXkK6BTVrWMKPcnPHJFCSHGgJWm/L/x7qBzUn-L.png) 3 tons/sq. inch would be the usual 2 1/2" proof; for a max. service load of about 9000 psi
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Sidelock
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Sidelock
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Thanks Dr. Drew. The thin parts of the barrels are 6" from the Muzzle. Plenty of meat 50-60 thou around the chambers.
Last edited by Argo44; 11/13/24 04:42 PM.
Baluch are not Brahui, Brahui are Baluch
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Sidelock
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Sidelock
Joined: Jan 2002
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Pretty as it may be I'd never buy it. I buy guns to use, and I'd eventually dent a barrel. Plus, I've zero use for a Cyl. "choked" 12 GA. gun.
May God bless America and those who defend her.
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old colonel |
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Sidelock
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Sidelock
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Mike Orlen told me that a garden hose could withstand the pressures at or near the muzzle end. Gil
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Sidelock
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Sidelock
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Choke boring was essentially "invented" by Greener in 1875. It did not become popular until he demonstrated at "The Field" trial that spring then took London by storm. But still for the next 5 years more shotguns were sold cylinder bore than choked. Gun users were very conservative.
Last edited by Argo44; 11/13/24 05:26 PM.
Baluch are not Brahui, Brahui are Baluch
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Sidelock
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Sidelock
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Gene: I assume (hope) you mean .050 - .060 "around" 6 - 8 inches
C.I.P. recommended wall thickness for 12g proved at 850 kg per sq. cm. (BAR) = 13,920 psi for a service pressure of 10,730 psi for Category 1 “Standard Steel” (Non-alloy AISI 1045) with tensile strength = 101,526-123,137 psi
End of chamber - .079”
4” from breech - .075”
8” - .043”
Category 1 would fit the industry standards for 4140 Chrome Moly & 4340 Chrome Moly Nickel - both are “low alloy” steel and about twice the tensile strength of crolle damascus
For a pattern welded barrel I would want .105" at the end of the chamber and .045 at 9"
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1 member likes this:
Ted Schefelbein |
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Sidelock
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Sidelock
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British proof works on the internal diameter of the bores at 9 inches from the breach.
A gun goes out of proof if that measurement is increased into the next bore size.
The system does not measure the subsequent loss of wall thicknesses that may result from external striking down, unlike some European proof houses that mark the weight of the barrels at proof and only allow a percentage weight loss before the gun ceases to be in proof.
The good news is that minimum wall thicknesses are generally in the front end of the barrels where the pressure curve is low.
The bad news is that there is little margin for dent raising or bulge striking down in the thin areas.
The Gun Trade prefers to avoid anything under 20 thou for that reason but some lightweight guns (particularly 2” 12 bores) May have been less than that when new. What this guy said…. .015 wall is pretty thin. It really matters what the measurements of both tubes are at the 9” point, and what ammunition you are thinking of feeding it. Stan, ever hunt ruffed grouse? Or, how ‘bout pheasants in the cattails, behind a snow storm, when the daytime temps are below zero and you have to kick them loose in front of a Setter or a Pointer? Cylinder has its place on a 12. Sometimes. Best, Ted
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Sidelock
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Sidelock
Joined: Mar 2007
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Choke boring was essentially "invented" by Greener in 1875. It did not become popular until he demonstrated at "The Field" trial that spring then took London by storm. But still for the next 5 years more shotguns were sold cylinder bore than choked. Gun users were very conservative. Greener developed choke boring, but its invention is generally credited to William Pape, who probably took the credit for one of his gunmakers at the time. However, its invention has also been attributed to Fred Kimble, Jeremiah Smith, and probably a half-dozen others.
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Argo44, sharps4590, Stanton Hillis |
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Sidelock
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Sidelock
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No, never hunted grouse, Ted. Probably never will. That's why I qualified my statement as being for me, and my usages. If I can kill game with a Cyl. gun I can do it with a smaller bore than a 12. My reasoning is no good for anybody but me. But for me and my hunting, it works.
Regardless who invented it, it was invented. And it is very useful.
May God bless America and those who defend her.
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1 member likes this:
Ted Schefelbein |
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