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04-01-2011, 02:14 PM
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measure chambers on 25-2
How do you accurately measure chambers on 25-2 cylinders?
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04-01-2011, 04:37 PM
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Access to a set of machinist's gage pins is the easiest. Keep inserting gage pins until one will not enter. The chamber bore hole is smaller than that pin and larger than the next smaller size that enters.
Or, you can use a soft lead slug (unsized cast bullet, or lead fishing sinker weight, etc) and gently tap it through the chamber bore from the backside. This is easily done with the cylinder out of the revolver and using a wooden dowel or cleaning rod. Measure with micrometer.
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04-01-2011, 04:59 PM
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Thanks John
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04-01-2011, 05:55 PM
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Are you asking about measuring chambers or throats?
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04-05-2011, 01:57 PM
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Good question - the lead bullet trick seems pretty good for the throat.
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04-05-2011, 03:08 PM
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I know it's not considered the most accurate method, but I measured mine with a digital caliper. Got the same reading when I tapped a lead bullet through and then measured. They are all just a hair under .452. The throats, that is.
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04-05-2011, 05:20 PM
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Digital calipers usually aren't good enough. I use a telescoping gauge and a vernier micrometer which will also allow measuring out of round. Gage pins work but will "read" the smallest diameter if the hole is "out of round", so can be deceptive. 25-2's are notorious for having cylinder throats measuring .454" - .456".
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04-07-2011, 07:56 AM
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I used a .451 jacketed round nose and it dropped through and feeled like it hardly touched. It must have the .454 throats. My 22-4 has to have help to pass through with the same bullet.
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04-07-2011, 11:36 AM
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Quote:
Originally Posted by deanodog
I used a .451 jacketed round nose and it dropped through and feeled like it hardly touched. It must have the .454 throats.
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Sounds likely, I can't remember measuring a 25-2 with throats smaller than .454".
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