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Thread: 9mm japanese revolver

  1. #1
    Boolit Master


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    9mm japanese revolver

    Ok..so I'm finally looking at reloading for it. I picked up my 3rd type 26 this weekend..and figure I need a project. Many many decades ago I got my first one..that was back before I reloaded. I actually found ammo for it and shot it a bit... Fast forward and now I only know where 1 round is. I believe I have some brass coming to me on a trade.

    Now then... Reloading... Been reading some archived posts here and there. Seems many people are using certain brands 38sw..and thinning the rim... Sizing with a 38spl die and then loading with the 38sw die. Still others are loading 38 acp / 38super and just shortening the case 1mm and possibly neck turning. 38 super is 9×23sr and 9mm jap revolver is 9x22r.. But people say the super rim is big enough to catch the extractor. I have 38sw brass but don't feel like rigging up a rim cutter. I may have some factory 38 super floating around..and can neck ream or turn..and lastly.. I may be getting some 9mm jap revolver brass.

    Question... What tooling would you load with? Size with 38spl?
    I do have 38 acp dies .. So that's a seating option.

    I looked up the fps and pressure..and the 9mm jap revolver is about 66-75% of a 38sw..depending on the loading..ie..5xx fps range. I see factory loads in 150gr.. And many reloaders using 120-130 cast lead.

    Most of the internet stuff I read is dated from early 2000 to 2013... Not many shooters of this.

    Anyone here load for it?

    Thanks

  2. #2
    Boolit Buddy
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    I don't know anything about the 9mm Japanese revolver but the 38 S&W has a fatter case than a 38 Special. I cut down some 38 special cases and fireformed them to use in a 38S&W and while they worked just fine you can see an obvious bulge in the case. But since this is a low pressure cartridge they reload just fine. I do use 38 S&W dies when sizing to avoid overworking the brass.

    Since 38 S&W cases are probably unobtainun now I would cut down a 38 special case and see if the rim fits the cylinder. Wartime Japanese firearms can have some generous tolerances so you might get lucky. I believe the special and the S&W cases both have the same rim thickness so you would have to trim either of them if they don't fit.

  3. #3
    Boolit Master schutzen-jager's Avatar
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    in the past i have sized .38 S&W cases in a .38 special sizing die to use in mine -
    never pick a fight with an old man - if he is too old to fight he will just kill you -
    in this current crisis our government is not the solution , it is the problem ! -

    ILLEGITIMI NON CARBORUNDUM

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  4. #4
    Boolit Master


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    Quote Originally Posted by Delkal View Post
    I don't know anything about the 9mm Japanese revolver but the 38 S&W has a fatter case than a 38 Special. I cut down some 38 special cases and fireformed them to use in a 38S&W and while they worked just fine you can see an obvious bulge in the case. But since this is a low pressure cartridge they reload just fine. I do use 38 S&W dies when sizing to avoid overworking the brass.

    Since 38 S&W cases are probably unobtainun now I would cut down a 38 special case and see if the rim fits the cylinder. Wartime Japanese firearms can have some generous tolerances so you might get lucky. I believe the special and the S&W cases both have the same rim thickness so you would have to trim either of them if they don't fit.
    38sw is still very available.. Most of what I'm reading is people trying multiple brands of 38sw till they find one with a thinner rim that fits..and then as schutzen said..sizing with a 38spl die

    I might have to do that...

  5. #5
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    I think the 38 Super has a slightly slimmer rim. No idea if that helps any.

  6. #6
    Boolit Master schutzen-jager's Avatar
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    Quote Originally Posted by MrWolf View Post
    I think the 38 Super has a slightly slimmer rim. No idea if that helps any.
    the resized .38S&W ones will sometime let the ejected case slip under star when ejected, but causes no real problem -
    never pick a fight with an old man - if he is too old to fight he will just kill you -
    in this current crisis our government is not the solution , it is the problem ! -

    ILLEGITIMI NON CARBORUNDUM

    as they say in latin

  7. #7
    Boolit Grand Master
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    Off the top of my head (I don't think I have ever actually seen one of these) if you have an assortment of .38/9mm ish dies, play around and see what works for you. That is what I do for the .38 Special/.357 Magnum, I think I have somewhere around five or six sets of .38 dies plus the occasional oddball die.

    It may not hurt to do chamber casts of your cylinder either.

    Robert

  8. #8
    Boolit Master


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    Can't wait till my brass arrives to play with. Thanks for the ideas guys.

  9. #9
    Boolit Master



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    When I first saw this thread, I wondered if 380 rimmed would be useable. I kept quiet because I didn't want to sound stoopid!
    Instead, I started trying to do some research on 380 rimmed. There is not much out there on 380 rimmed. What I did see made it sound possible as it is a 38 S&W substitute. As little of it as there is out there, it might all be as acceptable as the one brand of 38 S&W, or not!

    For those of you who have never heard of 380 rimmed, I have heard it is a European thing where civilian firearms can not be chambered in military calibers. So they add a rim and, voila, it is legit! So 380 rimmed, 7x57R, and 8x57R.

  10. #10
    Boolit Buddy Nines&Twos's Avatar
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    Wonder how close it is to 9mm Federal?
    Isaiah 45 - I AM the Lord and there is none else

  11. #11
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    9x22R Japanese was loaded to LESS than .38 S&W pressure- which is very low.
    According to the Internet…..


    Sent from my iPhone using Tapatalk

  12. #12
    Boolit Master schutzen-jager's Avatar
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    loaded mine with 2.3 grains of red dot behind 158 grain lead swc with no problems - can't recall where i got the recipe
    never pick a fight with an old man - if he is too old to fight he will just kill you -
    in this current crisis our government is not the solution , it is the problem ! -

    ILLEGITIMI NON CARBORUNDUM

    as they say in latin

  13. #13
    Boolit Master


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    ystronger.yep..istronger.yep..its 66 to 75% the pressure of a 38sw

  14. #14
    Boolit Bub Kentucky146's Avatar
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    mmmm I was reading, got to wondering largo? I know 9/22 jap loaded lower than 38spl from the reads. so many different 9mms out there for sure

  15. #15
    Boolit Master


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    Just getting around to working on this project.

    I have some brass that has been made from 38spl with the rim thinned and case shortened.
    I know this load should be less than 38sw.
    I dug around in old manuals from the 60's looking at 38sw load data. Most of it is 590-7XX.
    Now..the sparse data I can find on 9mmJR is about 490fps.

    Looking at 38sw load data and extrapolating for weight, I *think* I can do 2gr unique and get 450 fps using a 124gr projectile. The bullseye load is more like 1.5gr when extrapolated. I have both powders.
    Now.. The few commercial loads I see are 150gr... I'd like to skip that completely.. I'm punching paper..not shooting allied invaders.
    That said..i have 38sw data to calculate with for 124gr..and I have 124 and 125gr lead projectiles..but I also have 95gr lead too.
    Any reason to *not* drop to 95 gr to reduce pressures even further.. One of my guns is within the first 800 built..so definitely antique..the other 2 are late in the standard build serial range in the 4XXXX area.
    So..124gr or 95gr?
    And reduced unique or reduced bullseye?

    Ps..i had a spare set of 38sw/colt dies I setup..i made an un primed un charged dummy round using the resized brass and seated and crimped a 124gr in.. Chambers in revolver perfectly... So that part is cake.

  16. #16
    Boolit Master


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    Ran out at lunch for a test drive.



    Well..good news. My anemic slow 95gr over 1.9gr unique rounds worked perfectly...about as loud as a 22lr ..maybe a tad quieter between a short and lr.



    Punched paper at 10 paces and made holes in the dirt mound backdrop.



    Feel real happy with those loads on these old Japanese BP framed guns.

  17. #17
    Boolit Master
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    who would have thought the 38s*w would be a hot load by comparison.. better hang on tight to that gun might get away

  18. #18
    Boolit Master


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    I know..right... 38sw would be the 9mm jap revolver magnum....haha..

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check