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Forums10
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Apr 29th, 2024
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Joined: Jan 2002
Posts: 1,478 Likes: 16
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 1,478 Likes: 16 |
Pete Mazur uses an ultrasonic instrument to measure barrel wall thickness and it works very well.
C Man
Life is short
Quit your job.
Turn off the TV.
Go outside and play.
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Joined: Jan 2006
Posts: 9,427 Likes: 314
Sidelock
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Sidelock
Joined: Jan 2006
Posts: 9,427 Likes: 314 |
The next time you speak with Pete, please inquire as to the specific ultrasonic wall thickness instrument he uses, and his minimal wall thickness criteria at the end of the chamber, 9" from breech, and overall MWT. Thank you.
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Joined: Dec 2002
Posts: 585 Likes: 9
Sidelock
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Sidelock
Joined: Dec 2002
Posts: 585 Likes: 9 |
Without going into detail, I purchased Galazan's wall thickness gauge and began measuring my barrels. One of my guns measured .014 thickness whereas before I thought there was about .025 minimal wall thickness. Needless to say, I now love my Galazan gauge. Question: If you've been shooting your 12 gauge double for years and discover 0.014" wall thickness out near the muzzle, or anywhere else, do you quit shooting it?
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Joined: May 2004
Posts: 2,092 Likes: 13
Sidelock
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Sidelock
Joined: May 2004
Posts: 2,092 Likes: 13 |
In my case I had only shot it once at sporting clays. Ignorance is not bliss and although I had no problem with it once I knew things change. It is in the back of your mind and it affects your performance if not your safety and those around you. If it is way down the barrel where the pressures are lower there is probably little risk to life and limb. When looking at a feeler gauge at .014 and you see the thickness it gives you pause for thought. There are many guns out there that are fun. Better to replace it with one that reduces the risk. It is easy to dent and what do you think your barrel smith would say about fixing it? I sold it for parts and took a loss.
So many guns, so little time!
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Joined: Mar 2011
Posts: 4,081 Likes: 473
Sidelock
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Sidelock
Joined: Mar 2011
Posts: 4,081 Likes: 473 |
Without going into detail, I purchased Galazan's wall thickness gauge and began measuring my barrels. One of my guns measured .014 thickness whereas before I thought there was about .025 minimal wall thickness. Needless to say, I now love my Galazan gauge. Question: If you've been shooting your 12 gauge double for years and discover 0.014" wall thickness out near the muzzle, or anywhere else, do you quit shooting it? I wouldn't shoot a gun knowingly that had MWT of .014" near the chamber. I was told by a barrel man that at the muzzle, a garden hose could be safely used to contain the pressure. Gil
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Joined: Jan 2002
Posts: 1,478 Likes: 16
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 1,478 Likes: 16 |
The critical measurement for wall thickness is traditionally 9" ahead of the breech. If this where most people measure them?
I'll probably talk to Pete in the next few days and I'll ask him.
Last edited by Chukarman; 07/10/17 09:06 PM.
C Man
Life is short
Quit your job.
Turn off the TV.
Go outside and play.
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Joined: Jan 2006
Posts: 9,427 Likes: 314
Sidelock
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Sidelock
Joined: Jan 2006
Posts: 9,427 Likes: 314 |
The critical WT measurement(s) are every inch from breech to 16-18" (the location of the forward hand), esp. the end of the chamber and forcing cone if the chamber or cones have been lengthened. End of chamber, 9" from breech and muzzle, and overall MWT are the numbers commonly reported. A dealer's listing of only MWT means little. https://docs.google.com/document/d/1ZIo0y746UsSRZIgRuuxwAbZjSBHitO_EanvwLYc-kGA/edit
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Joined: Jan 2006
Posts: 9,427 Likes: 314
Sidelock
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Sidelock
Joined: Jan 2006
Posts: 9,427 Likes: 314 |
C guy - any follow up from Pete regarding his US wall thickness gauge and his acceptable numbers; end of chamber, 9" from breech and muzzle, and overall MWT?
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Joined: Dec 2001
Posts: 6,994 Likes: 402
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 6,994 Likes: 402 |
Rule 18 of the "Rules, Regulations and Scales" published by the Guardians of the Birmingham Proof House stipulates the bore be measure 23 cm(9.055")from the breech face. Wall thickness must be considered the whole distance of the tube by especially in the area it could be dangerous as Drew has pointed out. The proof house does not have a minimum wall thickness required. Tube set must simply pass proof. http://www.gunproof.com/Proof_Memoranda/RULESOFP.PDF
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Joined: Jan 2002
Posts: 1,478 Likes: 16
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 1,478 Likes: 16 |
C guy - any follow up from Pete regarding his US wall thickness gauge and his acceptable numbers; end of chamber, 9" from breech and muzzle, and overall MWT? Haven't talked to Pete for a while. I am leaving shortly for fishing in Idaho, will talk to Pete when I get back and post up here to let you know. Mike
C Man
Life is short
Quit your job.
Turn off the TV.
Go outside and play.
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