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DrBob #268966 03/04/12 03:52 PM
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Just for perspective, keep in mind that about all of you would not give a second thought to touching off a modern high performance, high pressure pheasant or duck load in this gun.


Yet if you look at it, the engraved barrels have sharp stress risers right over the highest pressure area of the barrels. Some of you have even taken old Fox guns and had the barrels engraved similarly. A stress riser on the outside is far more likely to cause failure than one on the inside of a thick wall tube under pressure. I'm not saying the barrel above is prone to fail, but rather you should temper your concerns with the knowledge of that gun above and other old guns with engraved breaches. It shows that some depth of pitting, especially on the interior, is of little concern.

DrBob #268990 03/04/12 06:51 PM
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http://www.gunproof.com/Proofing/proofing.html
"Proof regulations require that shotgun barrels shall be “struck-up” and smooth and that insides shall be clean. Pitting should be removed so far as is practicable, bulges knocked down and dents raised."

Could one of our British brethren please explain why? Is "practicable" wall thickness dependent?

Last edited by Drew Hause; 03/05/12 08:35 AM.
DrBob #269075 03/05/12 04:52 AM
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I do think it is worth pointing out that a great many damascus and twist guns have been put back into regular service without reports of blown barrels. It tells us something.

Today if you keep your ear to the wind you would know it is much more dangerous to be shooting a Kreighof. I used to shoot a lot of ATA trap, one of the most popular competition guns is the vaunted Kreighof K80. For the last 10 year at least they are reported to have experienced catastrophic barrel failure (shrapnel flying 200 feet etc). Seems no other brand and model gun in the ATA is doing this. It also only seems to happen on the trap field, never skeet or sporting clays. As one poster on Trapshooter pointed out with everyone carrying a cell phone why are there no pictures of these events, ever? Is this the same way we came to believe composite barrels were prone to failure?

http://www.trapshooters2.com/cfpages/thread.cfm?threadid=278869&Messages=17

http://www.trapshooters.com/cfpages/thread_archive.cfm?threadid=173882&Messages=165

DrBob #269089 03/05/12 08:32 AM
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Drew,

I am certainly no expert on British Proof Law but...

Perhaps a pitted barrel must be reamed to remove all pitting so that a visual inspection may ensure that all pitting is removed, i.e. no never-ending pits that some worry about.

With the Grand Canyon of pitting removed if the barrels withstand the proof loads then it should be safe to shoot with the loads it was made to shoot (as indicated on the watertable).

Just my logic,
Mark

Last edited by MarkOue; 03/05/12 08:33 AM.

USMC Retired
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