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pooch Offline OP
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As difficult as interpreting rivelling in a barrel. Interpretation the rings or light refraction in the barrel is more difficult. The light ring is caused by an anomaly in the barrel. The question is the anomaly a fatal one or one you can live with.

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Pooch
what you are saying makes sence to me. Sounds like a good way to check it.
Monty


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Originally Posted By: pooch
As difficult as interpreting rivelling in a barrel. Interpretation the rings or light refraction in the barrel is more difficult. The light ring is caused by an anomaly in the barrel. The question is the anomaly a fatal one or one you can live with.


Generally, if the ribs are tight, I would not worry about this kind of small ring bulging, from a safety concern.

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pooch Offline OP
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You are probably mostly right. I do think you ought to back off on the loads.

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There are a number of copies of Shotgun Technicana on Amazon.com... from $100 to $1100+ !!

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pooch Offline OP
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I'm not overly fond of McIntosh for reasons of my own. I won't be buying that book.

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Pooch,
If you want to back off even more from a conservative load, that's a personal choice and sure won't hurt anything. But my opinion is that the barrels themselves are not weakened from this condition. But if you are trading utility of the gun in order to back off your load, I would say it is not necessary for this condition. A quick look at some stress-strain curves for steels of similar strength will show that strength from this type of deformation is actually increased, not decreased, albeit a very small amount.

There are literally millions of products made from cold formed steels of similar charateristics to barrel steels. Many of these products carry critical loads. An example is hydraulic and fuel hardlines in airplanes. These lines are made from steel tubing. They are cold formed (bent) to fit the routing in the airplane. The deformation is many times more from this bending than a small bulge in a barrel. The function of these lines are critical to the normal operation of the airplane. These thin little hydraulic lines operate at 3000 psi with pulse spikes to much higher.

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Originally Posted By: pooch
...I believe it is caused by the light undergoing a slight shift when it hits the metal that has a different molecular structure then the metal beside it...



You mentioned that this may be a sign of deformation in the barrel but you seem to feel the tube is true. I think you are seeing deformation, but if the barrel is true, I don't know if differences in surface appearance could lead to significant conclusions. The book that was mentioned might be worth checking. You may not prefer one of the authors, but I think there is meaningful contribution by the coauthor.

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G.T. Garwood has an illustration of barrel rivelling in one of his books. The photo was taken after striking off the barrel blue with a sanding block, the absence of blue on the high points clearly indicating the presence of a series of physical prominences or corrugations in the barrel wall. The angle of incidence and reflection of light from a shotgun bore is a very pretty thing and the relative concentricity of the rings has been said to prove a number of things about the barrels (straitness, relative vertical regulation of sxs barrels) but I've never encountered anyone who claimed to identify changes in the molecular architecture of an apparently homogenous material with the naked eye. I doubt if Thomas or Trevallion have either.

jack

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