WidenersMidSouth Shooters SupplyADvertise hereInline Fabrication
Titan ReloadingLee PrecisionRotoMetals2

Results 1 to 11 of 11

Thread: Forming 8mm Nambu

  1. #1
    Boolit Master DonMountain's Avatar
    Join Date
    Nov 2011
    Location
    Mid-Missouri
    Posts
    984

    Forming 8mm Nambu

    Has anybody formed cases successfully for an 8mm Nambu? If you have can you give me some ideas? A friend of mine showed me a very nice Nambu pistol his grandfather got overseas before world war two. It is in very nice unworn condition. He said that his grandfather had ammo for it also and they fired it a few times back around 1960. After receiving it, he hasn't seen any ammo for sale for it, and now reloads for a hobby.

  2. #2
    Boolit Buddy
    Join Date
    Jun 2013
    Location
    Lynn Ma
    Posts
    398
    Just looked and PPU makes ammo for the Nambu. Graf's has it

  3. #3
    Boolit Master

    Hamish's Avatar
    Join Date
    Jan 2011
    Location
    Edge of The Crab Orchard National Wildlife Refuge
    Posts
    3,344
    .357 Sig or .40 S&W brass. Length is almost correct, will need made very slightly smaller with a push through die which would be much easier than this method:

    https://youtu.be/oi5s6xHrojk

    Contemplating doing an 8mm Nambu single shot rifle myself.
    More "This is what happened when I,,,,," and less "What would happen if I,,,,"

    Last of the original Group Buy Honcho's.

    "Dueling should have never been made illegal in this country. It settled lots of issues between folks."- Char-Gar

  4. #4
    Boolit Master
    Join Date
    Jan 2016
    Posts
    510
    Decades ago, before Midway and FC 8mm Nambu brass, GONRA made it from .41 LONG COLT.
    When you do stuff like this, brass selection is based on HEAD DIAMETER.
    Perfect match in this case....

  5. #5
    Boolit Master DonMountain's Avatar
    Join Date
    Nov 2011
    Location
    Mid-Missouri
    Posts
    984
    I just checked the cost of dies for the 8mm Nambu and found the cheapest set for about $190. It looks like this one is a non-shooter due to the extremely high cost of reloading for it. I guess the pistol is just a wall-hanger then. Too bad since it is in very good shooting condition with all of its bluing still on the gun.

  6. #6
    Boolit Master

    Join Date
    Mar 2011
    Location
    oklahoma
    Posts
    1,602
    Looks like $125.52 at CH4D. Still more than I'd want to pay, but I'd hate to have a wall hanger pistol just due to a lack of ammo.

  7. #7
    Boolit Bub
    Join Date
    Jun 2009
    Posts
    31
    When I was shooting 8mm Nambu I would use 357 Sig cases. I would first run then up into a 30-30 sizing die far enough to size the rim and head to the proper diameter and then knock them out with a hammer and punch. Run those through the Nambu sizer and then trim.

  8. #8
    Boolit Man
    Join Date
    Feb 2009
    Location
    hawaii
    Posts
    88
    Use an old 30/30 rifle sizing die with the the top of the die cut off, and get a lee bullet sizing ram that is close to the .357 sig case base size (I forgot what size I used) and use plenty of sizing die wax to size 357 sig cases by pushing them completely through the die with no need to hammer the cases out, as they pop out the top of the modified 30/30 sizing die with cases sized to the proper outside rim and body dimensions ready to form the neck by running through the 8mm nambu die. Then trim and chamfer deburr necks, anneal, and load as normal. Sometimes the original Nambu pistol extractor won't grab the rim of the thicker 357 sig case, and rather modifying your irreplaceable original go get another extractor from Don, (address below) you send him the top end of your Nambu and he will fit another extractor that is tailored to the .357 sig cases and not ruin your original for 40 bucks (he does not charge for the fitting). Veral Smith of LBT years ago made me a custom 4 cavity cast bullet mold that is the bee's knees for the 8mm nambu,I gun powdercoat them, and they shoot really nice and makes cleaning the pistol a breeze. I'd give him a call. Let me know if I can be of any other help. https://www.nambuworld.com/donspartslist.htm http://lbtmolds.com/OurMolds/tabid/5807/Default.aspx
    Aloha No
    Last edited by rrob692326; 10-06-2019 at 05:41 AM.

  9. #9
    Boolit Master
    Join Date
    Feb 2006
    Location
    Kaneohe, HI
    Posts
    3,622
    Another hawaii guy.
    I thought I was the only one here.
    Now I don't feel so alone.

  10. #10
    Boolit Master dbosman's Avatar
    Join Date
    Feb 2013
    Location
    East Lansing, MI, USA
    Posts
    1,782
    For what it may be worth, Graf's has brass.
    https://www.grafs.com/catalog/product/productId/77583

  11. #11
    Boolit Master
    Join Date
    Jan 2016
    Posts
    510
    GONRA suggests (warm up yer cheque book!) just purchase Grafs 8mm Nambu brass! Should be WAY BETTER than anything you can womp up.....

    (Decades ago, made 8mm Nambu brass from all sorts of host brass. Verked Just Fine. BUT - its LOTTSA verk.
    As tyme went on, purchased pyles of Midway and FC factory brass and jacketed boolits.)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
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