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Joined: Dec 2001
Posts: 496 Likes: 12
Sidelock
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OP
Sidelock
Joined: Dec 2001
Posts: 496 Likes: 12 |
Here is a picture of proof stamps, W&C Scott Monte Carlo B 10ga barrels re-blued Current measurements 2 7/8" chambers .777/.776 bores, min walls .035/.040, chokes .037/.037 Thanks I can't read proof stamps.Is this gun still in proof? Thanks  
Last edited by Craig Larter; 02/12/14 12:53 PM.
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Joined: Jan 2002
Posts: 866
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 866 |
Craig,if the bore measurements are correct the barrels are just out of proof. 11/1 covers bores up to .775. Suggests that some fine boring has occurred, probably to cleanup frosting near the chambers. the nitro proof marks are circa 1896-1904
Better to keep your mouth shut and be thought stupid,than open it and confirm.
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Joined: Dec 2001
Posts: 496 Likes: 12
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 496 Likes: 12 |
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Joined: Dec 2001
Posts: 3,971 Likes: 103
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 3,971 Likes: 103 |
Craig, if you are using a ball type bore gauge and calibrating it with a .700 ring I have found that when measuring a 10 bore the reading will be .003 to .005 larger than it actually is. Possibly even more. I lathe made a .775 adjusting ring to eliminate this "creeping" error. I think the error is due to the fact that as the three balls extend out in a larger bore the measuring rod that extends to the dial caliper does not change in a direct ratio to the movement. Clear as mud? Just trust me there is a significant error....
With a .700 ring I find that if a bore is only .729 there is a couple thousanths error due to the balls.
John McCain is my war hero.
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Joined: Dec 2001
Posts: 496 Likes: 12
Sidelock
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OP
Sidelock
Joined: Dec 2001
Posts: 496 Likes: 12 |
Thanks Joe but I am using a Galazan bore gauge with a .775 ring. I believe the measurements are accurate.
I am sure Terry is correct in his assessment they were lightly honed in the past. They still have great wall thickness in front of the chambers and 9" from the breech. Boy does it shoot great patterns!
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Joined: Jul 2005
Posts: 7,065 Likes: 1
Sidelock
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Sidelock
Joined: Jul 2005
Posts: 7,065 Likes: 1 |
Joe if you will calibrate your bore gauge with the .700 range and then use it to measure the ID of the .750 calibration ring you can tell Craig exactly how much the error is.
I am glad to be here.
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Joined: Jun 2008
Posts: 5,696 Likes: 226
Sidelock
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Sidelock
Joined: Jun 2008
Posts: 5,696 Likes: 226 |
Yawn ! 
Last edited by skeettx; 02/12/14 04:38 PM.
USAF RET 1971-95 ![[Linked Image from jpgbox.com]](http://www.jpgbox.com/jpg/57865_80x60.jpg)
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Joined: May 2008
Posts: 1,079 Likes: 393
Sidelock
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Sidelock
Joined: May 2008
Posts: 1,079 Likes: 393 |
Gentlemen;
I have both a English made very best quality multi-gauge bore gage and the less expensive USA made bore gauge with 3 balls. Both measure the same.
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Joined: Dec 2001
Posts: 12,743
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 12,743 |
If you set a dial bore gage to a setting ring & it doesn't read correct over its entire range it Ain't Much of a Gage. I used a bunch of dial bore gages working as a machinist for 35+ years & they all had a single setting ring per gage & would read any size to which they would contract or expand accurately.
Miller/TN
I Didn't Say Everything I Said, Yogi Berra
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Joined: Jan 2002
Posts: 866
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 866 |
BTW Craig, that is a very fine shotgun.Congrats if you are the owner. Love the rounded bar action and great condition. Wouldn't
loose sleep over the slightly out of proof...
Better to keep your mouth shut and be thought stupid,than open it and confirm.
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