Anybody have the case dimensions for a 9mm, .38spcl, & .357 mag?

Anybody have the case dimensions for a 9mm, .38spcl, & .357 mag?

This is a discussion on Anybody have the case dimensions for a 9mm, .38spcl, & .357 mag? within the General Firearm Discussion forums, part of the Related Topics category; I did numerous internet searches for case dimensions and found nothing. This is in reference to my thread about converting a .357 mag lever action ...

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Thread: Anybody have the case dimensions for a 9mm, .38spcl, & .357 mag?

  1. #1
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    Anybody have the case dimensions for a 9mm, .38spcl, & .357 mag?

    I did numerous internet searches for case dimensions and found nothing.

    This is in reference to my thread about converting a .357 mag lever action to 9mm (Marlin also makes a version in .38 spcl). If the .357 barrel is compatible with the 9mm (.354") and I think it would be, then it may be possible to modify a .357 mag to 9mm. BBL would have to be rechambered of course and the bolt/extractor may have to be modified for the rimless 9mm case.

    But I'm thinkin' the case dims may be the first thing to look at; e.g. the .357 mag, etc. has straight walls and the 9mm case is tapered slightly.

    Any thoughts?
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    Senior Member Array ICTsnub's Avatar
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    Thanks - I actually looked there, but was looking for a dimensioned drawing and overlooked the dimension table.
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    Ex Member Array Mikey's Avatar
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    Why, not measure it your self? if it's really important to you.

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    Senior Member Array ICTsnub's Avatar
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    You get this figured out, and you need to get with the guy that converted his J frame to 9mm.

  6. #6
    JD
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    Don't know how accurate these are...

    I just Googled .38 Special Case Dimensions

    And got this as my first link: page8d








    Quote Originally Posted by Mikey View Post
    Why, not measure it your self? if it's really important to you.

    As you can see from the above pictures, it's not exactly that easy...not like you can whip out a 12" ruler and get the exact measurements and be exact regarding how to cut a barrel chamber.

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    Ex Member Array Mikey's Avatar
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    Yea, my bad I do this for a living so I forget the fact that regular people don't even know what pair of calipers is. I figured if a someone wants dimensions of the case he most likely capable of measuring. I guess it's not always the fact.

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    JD
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    Quote Originally Posted by Mikey View Post
    Yea, my bad I do this for a living so I forget the fact that regular people don't even know what pair of calipers is. I figured if a someone wants dimensions of the case he most likely capable of measuring. I guess it's not always the fact.
    Well it's not just that, you'd need a pristine case, this pretty much means that you'd need a bullet puller, a sample of 9mm, .38spcl, and .357, and you couldn't just use one case, you'd realistically need a variety of casings to check for margin of error, you'd have no real "control" sample, and if you didn't all ready have .357mag, .38spcl, and a 9mm, you'd have to go buy ammunition and unless you're going to the local shop here, you can't buy single cartridges.

    You couldn't use fired brass as the case mouth might be deformed altering your measurements, again you'd have no control group, unless you ordered correctly sized brass for reloading, if you don't have a reloading setup, that would also be a waste.



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    Senior Member Array ICTsnub's Avatar
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    Quote Originally Posted by Mikey View Post
    Yea, my bad I do this for a living so I forget the fact that regular people don't even know what pair of calipers is. I figured if a someone wants dimensions of the case he most likely capable of measuring. I guess it's not always the fact.
    Measuring a case on hand will only give that case's dimensions, not the SAAMI specs.

    And what JD said.
    Last edited by ICTsnub; November 17th, 2008 at 01:05 PM. Reason: Slow to the party

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    I have a digital caliper and a digital micrometer, but to make a conversion such as this, I feel better about working from specifications for the specific rounds involved.
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    Quote Originally Posted by ICTsnub View Post
    You get this figured out, and you need to get with the guy that converted his J frame to 9mm.
    IIRC, he actually had that conversion done by a gunsmith. I didn't get the impression he did it himself?????

    But, yeah, good connection! That'd be interesting too.
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    Senior Member Array ICTsnub's Avatar
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    Quote Originally Posted by Tangle View Post
    IIRC, he actually had that conversion done by a gunsmith. I didn't get the impression he did it himself?????

    But, yeah, good connection! That'd be interesting too.
    I think he did send it off. I seem to remember that the 9mm chamber was a little bit bigger than .38 every way but length. But the custom revolver and lever would be a cool two gun set.

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    Quote Originally Posted by ICTsnub View Post
    ...But the custom revolver and lever would be a cool two gun set.
    Wouldn't it!!!
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    Thanks for the links, JD. For some odd reason, only one of the pics showed up (for me) in your post, but I went to the links and got the pics there.
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  15. #15
    Ex Member Array Mikey's Avatar
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    indeed, specs are always good to have. But, unless you have tollerence given with the spec, it's just as good as you measuring it yourself.

    Guys I don't want to argue. You guys are all right, do it yourself when it comes to firearms is not the best thing to do.

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