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I can't find it so
I read not long ago safe barrel wall thickness but my computer don't remember so well so what is min. wall thickness.
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Calvin, people have generally said here .025 for a 12ga , but the British proofing houses will pass down to .020.
I am personally uneasy with anything close to .025 in a 12. Many light small bores came from the factory at close to .025, so that is a bit different. Most Parker 12's were factory produced at least .035. I would have to look up the hoop stress formulae again, but the greater the diameter, the greater the wall thickness needs to be to withstand the same internal pressure. I know you are a 10ga guy and I don't have enough experience with the 10's to know the average factory wall thickness on them or what would be acceptable after honing. I know lots of 10 ga guys shoot some heavy loads. If your intent is to load 1 1/4 3dre, then that is such a light 10 load, it wouldn't make much difference. If you want to experiment and see how much you can get, you need to know more than I can tell you. |
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Thanks for the clarification. I'm uneasy with any thin walls regardless of passing proof. Don't they proof it and pass it for rather light loads?
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British proof is not all it is cracked up to be and it is getting worse. According to the other shotgun forum, they are blowing up guns at a pretty great rate. Even the Brits are getting suspicious.
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I don't know how you can get it done now but used to you could get them standard proofed or proofed for service. Proofed for service was a good way to go, you told them the load you wanted to use in the gun and they proofed them as just slightly above that charge. I think now they use proof pressures that have been set up by the European Union and some of them are pretty sporty.
Destry |
My 12 measures .33 at 18 inches and .29 at 22 inches. ch
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