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10-01-2017, 09:04 PM | #3 | ||||||
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Definately a restriction of some kind. I have a 10 gauge lifter with a .006 bulge at the forcing cone. It still has .092 wall thickness and I have shot plenty of nitro loads thru it. This seems to be fairly common in side by sides of all makes as I have seen this more than a dozen times. Probably part of a wad or spider web was left in the bore. My gun does not have hammer marks and you have to look closely to see it. Hope this helps.
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10-01-2017, 09:14 PM | #4 | ||||||
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What the others said
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The Following User Says Thank You to Mills Morrison For Your Post: |
10-01-2017, 11:01 PM | #5 | ||||||
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"Barrel wall thickness in front of the chambers is .078-.067"
Is that at the end of the chambers? At the forcing cone? Just past the forcing cone? I would be VERY reluctant to shoot a pattern welded gun that has had a bulged chamber OR a MWT of .067" at 3". Please see http://www.doublegunshop.com/forums/...058#Post491058
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The Following 2 Users Say Thank You to Drew Hause For Your Post: |
10-02-2017, 12:30 PM | #6 | |||||||
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Quote:
I notice you say you would be very hesitant to shoot a pattern welded gun with a bulged chamber. Would your reaction be any different for a fluid steel gun? Just curious and thanks |
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10-02-2017, 01:24 PM | #7 | ||||||
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Despite anecdotal reports
Experts on Guns and Shooting, George Teasdale Teasdale-Buckell, 1900 http://books.google.com/books?id=4xR...8C&pg=PA373&dq On the subject of steel v. Damascus, Mr Stephen Grant is very clear, and much prefers Damascus for hard working guns. He related an anecdote of one of his patrons, whose keeper stupidly put a 12-bore cartridge into his master’s gun without knowing that he had previously inserted a 20-case, which had stuffed up the barrel. Fortunately, no burst occurred, but a big bulge, which, however, Mr Grant hammered down, and the gun is now as good as ever. We now KNOW that pattern welded tensile strength is a bit more than half of early Fluid Steel and modern AISI 4140 chrome moly. Yield strength is also much lower, so pattern welded barrels are likely to exhibit elastic deformity at lower pressures - ie. bulge before bursting. 3 issues: 1. We have no NDT technique that can establish that the bulge did not cause micro-fractures in the pattern welded laminate. 2. Obviously the chamber is the location of the highest pressure. 3. A chamber burst could cause a life-threatening or life changing injury. Barrel bursts down the barrel are usually splits, or look like the top of an opened tin can, and are much less likely to send shrapnel flying than a chamber burst Just not worth the risk, to me, and we must also consider the risk to a bystander - friend or family member. And in the civil suit it will be very easy to find an expert witness that will testify that the shooter exhibited "reckless disregard" by using an "intrinsically dangerous Damascus" barrel gun with a known chamber repair.
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The Following 3 Users Say Thank You to Drew Hause For Your Post: |
10-02-2017, 04:17 PM | #8 | ||||||
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I've attached some photos. This is a 16 ga O frame. Apologize for the quality. The hammer marks are faint and shallow and there is no perceptible bulge. You need to really look hard to see the hammer marks in the pattern. But you can feel them. Barrels are concentric and both barrels swamp in equally. Wall thickness measurements .078-.067 were taken in front of the forcing cone. Thanks for your comments, Garth
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10-02-2017, 07:16 AM | #9 | ||||||
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Thanks, I'll check my notes and take some pictures later today
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10-02-2017, 06:18 PM | #10 | ||||||
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If you have trepidation about shooting this gun with a hammered down bulge, I suggest you send the gun to a double gun professional for evaluation. Someone who works with gun barrels for a living. Such a person is Kirk Merrington. If he says you barrels are safe, they are safe. FYI:
http://www.merringtongun.com |
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