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Forums10
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Apr 29th, 2024
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Joined: Dec 2001
Posts: 12,743
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 12,743 |
Gunman;
My method of using the scale is to point the bbls toward an inderct light, such as a window, look into the bore & sliding the scale in the chamber measure to the shadow line of the cone. This has proven to be a ery accurate method & I have never encountered enough pitting to influence the measurement here. I think that a gun with that much pitting in the chamber I would not really be concerned with its chamber depth, but just want to know where to hang it.
I was aware the "Nominal" 2˝" British chamber was more apt to be from 2 9/19" to 2 5/8" but did not know from what point in time. They are essentially I believe interchangable with the Continental 65mm chamber.
Miller/TN
I Didn't Say Everything I Said, Yogi Berra
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Joined: May 2010
Posts: 1,534 Likes: 94
Sidelock
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Sidelock
Joined: May 2010
Posts: 1,534 Likes: 94 |
Don't have the exact figures to hand [at not at work with all my tables] but since 1985 with British proof becoming part of CIP rule we now use metric so yes the 65mm is standard with a plus tolerance of 2mm. Guns proofed before this date should and will be gauged under the previous rules of proof .
The designation 2&1/2" is actual nominal and the max and minimum sizes are somthing like min 2.510" maximum 2.660". I will look them up when I get back from a short break and post them if no one does sooner .
My comments re pitting in chambers dose come from the twin facts that American guns do tend to be kept cleaner than their British counterparts and that I probably look down a lot more barrels than most people who use this site .
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Joined: Dec 2001
Posts: 12,743
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 12,743 |
Gunman;
I have looked at quite a few US guns with severely pitted bores. As a general rule though the chambers themselves are ususally in pretty good shape, perhaps protected by the wax deposit left from the paper shells. Anyway, understand I am not trying to "Feel" the end of chamber but seeing the cone as a shadow & measuring to that line. I cannot recall looking into even a severally pitted barrle where that shadow line was not distinct. You simply slide the scale in until you se its corner touch that shadow. With just a bit of practise the accuracy acheivable will amaze you.
Miller/TN
I Didn't Say Everything I Said, Yogi Berra
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Joined: Dec 2002
Posts: 585 Likes: 9
Sidelock
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Sidelock
Joined: Dec 2002
Posts: 585 Likes: 9 |
The Galazan pocket size brass blade chamber gauge works quite well in many applications such as at a gun show where convenience over comes precision. Not a scientific instrument but quite practical in most cases. I have used mine, as shown below, for about 35 years and I can highly recommend it. You'll notice Tony's looks a lot like mine, not the other way around. Jolly 
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