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Apr 26th, 2024
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Joined: Jan 2002
Posts: 267
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 267 |
I saw a Perrazi o/u bbl with a bulge about a half inch past the chamber. The general opinion of the shooters standing around was that the bbls could not be repaired.
I am not so sure. What do you think?
danc
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Joined: Dec 2008
Posts: 2,292
Sidelock
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Sidelock
Joined: Dec 2008
Posts: 2,292 |
I saw a Perrazi o/u bbl with a bulge about a half inch past the chamber. The general opinion of the shooters standing around was that the bbls could not be repaired.
I am not so sure. What do you think?
danc The shooters are right, once the metal is deformed the steel molecules are distorted and fractured......repairing that bulge is very dangerous that close to the chamber, a weak point will always exist.........it would be an accident waiting to happen........time for a new tube......
Doug
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Joined: Feb 2005
Posts: 7,438
Sidelock
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Sidelock
Joined: Feb 2005
Posts: 7,438 |
Doug:
This at least for me raises an interesting point. I know there are other factors besides distance from the chamber but at a certain point down the barrel can a bulge be safely repaired?
Jim
The 2nd Amendment IS an unalienable right.
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Joined: Dec 2001
Posts: 3,964 Likes: 89
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 3,964 Likes: 89 |
Totally agree with Doug. The metal has exceeded it's elastic limits and the molecules have stretched and can not be restored to their original position and strength. A slight bulge near the muzzle can often be repaired without too much future risk but even there it will always be the weak link.
When an old man dies a library burns to the ground. (Old African proverb)
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Joined: Jan 2002
Posts: 13,149 Likes: 1147
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 13,149 Likes: 1147 |
I have tried it. Never again. You can't get to the part of the bulge that is under the ribs without removing them. Then you are getting into big money. If you decide to leave the part of the bulge under the ribs, you will still most likely pop the ribs loose while peening the bulge back into place, so you still have to relay them. There is always the chance there is a microscopic crack in the bulge that you can't see. Been there, seen that. Mine was discovered after removing the ribs.
It's a fool's game.
SRH
May God bless America and those who defend her.
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Joined: Jan 2002
Posts: 13,149 Likes: 1147
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 13,149 Likes: 1147 |
I have tried it. Never again. You can't get to the part of the bulge that is under the ribs without removing them. Then you are getting into big money. If you decide to leave the part of the bulge under the ribs, you will still most likely pop the ribs loose while peening the bulge back into place, so you still have to relay them. There is always the chance there is a microscopic crack in the bulge that you can't see. Been there, seen that. Mine was discovered after removing the ribs.
It's a fool's game.
SRH
May God bless America and those who defend her.
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Joined: Mar 2011
Posts: 2,982 Likes: 106
Sidelock
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Sidelock
Joined: Mar 2011
Posts: 2,982 Likes: 106 |
I agree, junk. Should be thrown away.
Socialism is almost the worst.
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Joined: Dec 2001
Posts: 2,961 Likes: 9
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 2,961 Likes: 9 |
Is it a mono block? I saw a K-80 have a new tube put in the mono block. NOT CHEAP but cheaper than a new barrel set.
bill
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Joined: Feb 2005
Posts: 7,438
Sidelock
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Sidelock
Joined: Feb 2005
Posts: 7,438 |
I hate to be a spoil sport here But I like to hear from someone who has direct information that a barrel failed due to a bulge
particularly if it was 12" or more ahead of the chamber.
Jim
The 2nd Amendment IS an unalienable right.
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Joined: Jan 2002
Posts: 5,954 Likes: 12
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 5,954 Likes: 12 |
I'd not advise repair, but am interested in the metallurgy of the question. As I understand stress-strain diagrams, after the metal yields, increased stress is required for further strain increases. That is, the metal is now stronger; often referred to as work hardening. I think, at least in theory, the bulged metal would be actually stronger than pre bulge. Anyone with a differing theory?
Again, I am most certainly not recommending repairing bulges near the chamber. Small bulges further down the tube and that don't extend under the ribs, different story.
DDa
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