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#577627 - 08/12/20 09:23 PM Re: British gun term? [Re: Toby Barclay]
craigd Offline
Sidelock
**

Registered: 02/18/09
Posts: 6680
Interesting comments Toby. I would have thought, if there was some evidence of barrel work that it might have had to be submitted for proof before being sold. I never would have suspected the auction house expediting a gun to the market.

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#577647 - 08/13/20 08:45 AM Re: British gun term? [Re: SXS 40]
KY Jon Offline
Sidelock
**

Registered: 03/09/02
Posts: 6524
Loc: Red State
A gun is not out of proof due to wall thickness. It will me if the barrel is enlarged or the chambers are altered from say 2 1/2” to 2 3/4”. Wall thickness does not mean a barrel can not be submitted for rep roof. Just that thin barrels may be more likely to fail proof or easier to dent. Below recommend wall thickness is a warning flag but you can shoot thin barrels. Just do so after a complete evaluation of the risk. I have several thin barreled guns but the only ones I shoot have the thin areas 20+” from the chamber areas

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#577657 - 08/13/20 10:40 AM Re: British gun term? [Re: KY Jon]
craigd Offline
Sidelock
**

Registered: 02/18/09
Posts: 6680
My only thought is that if proof can be trusted and the gun transfers legally, then the wall thickness can be assumed to be fine. I don’t believe that is true, but laws were followed? I was under the impression that there is a measuring process that has to be passed by a gun before a proof load is fired?

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#577690 - 08/13/20 04:03 PM Re: British gun term? [Re: SXS 40]
Toby Barclay Offline
Sidelock
***

Registered: 05/15/04
Posts: 701
Loc: Suffolk, UK
As KY Jon says above, wall thickness has no bearing on proof other than if it is thin enough the wall could fail, rivel or bulge which would of course mean it fails the reproof test.
No proof house has ever measured wall thickness as part of the proof test. They have a recommended minimum but that is all it is: recommended. They do not make any comment about the wall thicknesses and no measurement takes place BEFORE the proof test. The tube is 'viewed' for imperfections, pitting, bulges, dent etc and the chamber is checked to ensure that it meets the very exacting dimensions for its nominal chamber length and rim dimensions.
Bore diameter is measured after the successful proof test to establish what bore size is to marked on the flats.
Striking off the outside of the barrel wall does not effect the gun's state of proof.
The auction houses often undertake small amounts of work on guns submitted for sale, including arranging reproof, but at the clients cost and risk.

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#577693 - 08/13/20 05:01 PM Re: British gun term? [Re: SXS 40]
craigd Offline
Sidelock
**

Registered: 02/18/09
Posts: 6680
Thanks guys.

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#577707 - 08/13/20 07:55 PM Re: British gun term? [Re: SXS 40]
SXS 40 Offline
Sidelock

Registered: 05/02/05
Posts: 299
Loc: Ca.

Good information. Thanks all.

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#577716 - 08/13/20 10:17 PM Re: British gun term? [Re: SXS 40]
KY Jon Offline
Sidelock
**

Registered: 03/09/02
Posts: 6524
Loc: Red State
Thanks Toby. That should clear up a lot of our misconceptions about proof to many in the US. That is a issue many here do not fully understand. It took me a long time to understand it and even longer time to understand proof pressures and standard working pressures.

It is so much simpler over here where all barrels are thick as pump pipe and built to withstand stupid high pressure levels. Why a gun which can not stand 12,000 psi standard loads it is almost not worth shooting over here. BARs, LUPs and PSIs are so confusing to many.

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