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Sidelock
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Uh...no clue...the cicadas in my head claim it's heterogeneous amplitude harmonic oscillation wink

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Different elastic tension?

http://daggy.name/carillon/batmbook/chapter5.htm
Every solid body has a certain degree of elastic tension which, together with its density, determines the velocity of longitudinal vibrations running through it. This is expressed as V = (E/D)˝, in which V represents the velocity of longitudinal waves (in effect, the speed of sound through the material), E is Young's Modulus, or elastic tension in a solid, and D is the density value (mass per unit of volume). Using this formula, the speed of sound in a given solid V is obtained as a figure equal to the square root of the quantity produced by dividing Young's Modulus E by the density of the mass D. Therefore, the longitudinal vibrations in metal are proportional to the square root of the metal's elastic tension and inversely proportional to the square root of its density. All other modes of vibration in the material are correspondingly proportional to the longitudinal rate.

The steel is pattern welded barrels was very low in carbon; AISI 1002 - 1005 low alloy "mild" steel.

“Gun Steels” in 1891
https://books.google.com/books?id=-c8xAAAAMAAJ&pg=PA196&dq

.......Witten....Whitworth.....Vickers
C......0.47.......0.30 - .42.....0.24 - .27
Mn.....0.41......0.24 - .31.....0.22 - .23

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I have an extremely lightweight French made 16 gauge guild gun with ~27" fluid steel barrels. I shoot mostly 1oz Federals through it and though the gun kicks extremely hard it has a very quiet report. It's so quiet that friends I've hunted with have asked about it. I'm not sure if this adds anything to this thread or not.

Steve


Approach life like you do a yellow light - RUN IT! (Gail T.)
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Send me a chunk of barrel and I'll do a composition analysis Steve wink Maybe "mild steel"?

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Originally Posted By: volleyfire
This would be the perfect opportunity for some of you with a large shotgun collection to compare the sound of barrels, by tapping them just as you might to look for a loose rib. The sound will vary, even among fluid steel barrels, depending on length and thickness. But it seems plausible that a difference of pitch could be found between fluid and Damascus which would be more easily recognized without the noise of firing.
The fact that Walsingham might note the difference in use, is not surprising because he was obviously an athlete comparable to professionals of today. Their sensory reflexes surpass the average person.

I just did this test for you Volleyfire.
Four sets of sound barrels, all 12g SxS, thirty inch.
Webley & Scott, Damascus has a low note.
E. James, Twist is a bit higher note.
I. Hollis & Sons, Steel is a note higher
W. Cashmore, Steel is noticeably a couple of notes higher again.
The Hollis barrels are 3" chambered & heavy, while the Cashmore is 2 3/4 chambered & lighter.

I do know that on a nut farm where I used to shoot pest control that the boss could tell which of my guns I was shooting on the day. This was using the same ammo & each gun shot to a different note.
O.M

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anyone else been on the nut farm?

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Steve,

If you read comments made about me elsewhere, you will think I may be king of the nut farm...but every answer is not always simple.

Thanks for running the test Moses. It seems that there may be some real validity to Walsingham's statement.

Rockdoc your French gun really puzzles me. Is it over-bored?

Drew, that is a pretty complex bit of info, but I believe I got the basics. Given that, do you believe that cryo treating a barrel improves its function?

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VF: with enough bananas even a monkey can be taught to cut & paste wink ; that does not imply comprehension thereof!

I don't get this stuff either, and it's in non-deep-thinkin'-Missourian!
http://epic.physics.missouri.edu/PDF%20Files/Physics_of_Wind_Chimes-KimB.pdf

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Drew,

That is pretty funny. Despair not. I just spent a week being called a monkey's uncle for relating what I thought I understood.

I used to practice with a world champion shot. He would never voluntarily tell anyone, anything. One day I asked him why. He said, "They won't appreciate it." The older I get...

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Possibly it could be that the bore diameter on most Damascus barrels I have owned(mainly Lefevers)was usually about .005 larger than the fluid steel barrels. Also, back when I shot A.H. Fox guns with Chromox barrels, I had more than one fellow shooter on the dove field comment on how they rang. They said they could hear them all the way across the field.

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