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02-28-2011, 02:33 PM
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Join Date: Oct 2009
Location: Orlando
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New 642 38 +P
I recently bought a 642 38. The other day I tried inserting some 357 loads into the 642 to see how far they would stick out, and to my surprise they seated all the way down. Is this common on a 642? I always thought a 357 would not seat in a 38.
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02-28-2011, 03:14 PM
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Join Date: Jul 2007
Location: North Georgia
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Just out of curiosity I tried that with my 642-- a 357 Mag. ctg. would not seat to the rim, by a pretty good margin.
I'm sure you know this, but DO NOT shoot any 357 ammo out of your 642.
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02-28-2011, 03:14 PM
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Join Date: Jun 2010
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Open her up and check you model number. Sounds like you may have a model 640, the .357 version of the model 642. Because you are right, the .357 mags. should not fit in a .38 spl.
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02-28-2011, 03:42 PM
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642
Thanks for the suggestion I will check it out tonight.
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02-28-2011, 03:54 PM
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All the J frames have magnum length cylinders but it would be a pretty big slip up to get a magnum milled out cylinder on a 642. The Airlites have near identical cylinders properly milled for magnums but I think they are heat treated and of a different alloy composition. And while I’m not sure how much scandium is in the alloy it is a very different alloy than the Airweights.
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02-28-2011, 07:21 PM
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All the markings indicate a 642-2. Not sure what I have. Just tried a factory 357 and it seats to the rim.
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02-28-2011, 07:23 PM
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Even if you feel comfortable I would still call S&W and arrange a replacement cylinder to be fitted. That is an accident waiting to happen. It may not be you but it's too risky to leave to chance.
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02-28-2011, 09:18 PM
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Definitely call S&W! The huge pressure difference between +P .38 Special loads and .357 Magnum makes for an accident waiting to happen. If by some chance you have a 640 mislabeled as a 642, then S&W needs to document this, otherwise you have a 642 with a non-spec cylinder. Not good.
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03-01-2011, 09:28 AM
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I will contact S&W and let you know what they say.
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03-04-2011, 09:32 AM
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S&W Customer Service
After talking With S&W Customer Service, I will be shipping the gun to them for a cylinder replacement. Thanks for all your comments and advise.
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