Quote:
Originally Posted by moralem
. . . The 25-5 is a 1980, 4inch, with a pinned barrel and hogue grips. I don't have a serial number yet but will check the gun out in the next day or so. The seller says the throats measure 10 thousandths over spec of .452-.453. Not being a math wiz, but knowing my decimals that would mean the measurement is out to 4 places, .4521-4531. Is that even possible to measure with digital calipers? Even if he means over by 1/100ths that would still be in spec, right? .453-.454 . . .
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First, a review of the math . . . if the standard cylinder throat measures .452" . . . and the cylinder throats are 10 thousandths oversize . . . that would mean the throats are .462" (.452" + .010").
Second, pinned barrel model 25-5s from the 1980 era are well known for "oversize" throats, but normally they're in the range of .454" to .457". I've owned two such revolvers and they both ran .457" - .458". I put oversize in quotes because I've been advised that .457" - .458" is/was within SAAMI specs.
I currently have a Dec 1980 4" pinned barrel Model 25-5 with .451" to .452" cylinder throats . . . but I'm convinced the gun was sent back to S&W and the cylinder replaced. I say that because of the smaller throat size and the serial number is stamped on the rear face of the cylinder under the extractor. I suspect that more than just this one was returned for a cylinder replacement so check each one with a pin or ball gauge . . . or simply do a go/no-go test by dropping a .452" and then a .454" bullet down the cylinder throat.
Russ