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Thread: nambu 8mm

  1. #1
    Boolit Master
    Join Date
    Nov 2011
    Indian trail NC

    nambu 8mm

    anyone making this brass
    only saw rcbs dies $180.00 !!

  2. #2
    Boolit Master
    Join Date
    Jan 2012
    North Coast - Oregon
    Google the process.
    Cannot remember, but process included - .357 Sig (or 40 SW) brass, 8mm Nambu dies and 30-30 dies.

    Buy new Wolfe springs for the Nambu

    And I bought a box of Larry Potterfields boxes of ammo, a long time ago.

  3. #3
    Vendor Sponsor

    bullet maker 57's Avatar
    Join Date
    Dec 2012
    Hudson Valley New York
    I made it out of 40 S&W brass, using 8mm Nambu dies. Go slow with a little Imperial sizing wax. 1 out of 10 would not chamber.
    New England Custom Bullets Inc.
    13 Maywood Rd
    Newburgh, NY 12550



  4. #4
    Boolit Master
    Join Date
    Apr 2006
    East TN
    When I needed this caliber of brass there were none anywhere for sale. Dies are CH4D from Buffalo Bore, but they show out of stock at this time. You might call them to ask about ordering this caliber set and to hear about their price. I found a used NEI mold on ebay, makes very fine boolits - correct nose profile, diameter and weight. I started using 40 S&W brass for this conversion, then found 357 Sig brass was much easier to get a quality final product. A machinist friend made me a "blank" shell holder - flat and smooth on the top to push cases completely into the sizing die, then remove them with a brass rod from the top. Works like a champ with modest lube on the brass, too much lube gives up dimples. After forming the shoulder the rim and web areas have to be reduced to get the cases to fall into the chamber, also to reduce the strain on the extractor. Didn't want to tear up the pistol as replacement parts are sorta rare, don't you know. My load development involved Unique powder, just enough to cycle the action.

    If you can stand the strain, Grafs has new brass headstamped HDS (Huntington Die Specialties) listed at $72.99 per 100 pieces. HDS themselves also lists this caliber in stock at $37.98 per 50 pieces. IIRC, street rumor had it back in the day that these cases were actually manufactured by Starline but they do not show this caliber available in their listings today. Could be a trade agreement for no competition with HDS, but then how did Grafs get their supply? Whether you convert 357 Sig brass or buy ready to go brass, you still have to pony up for dies. Any time you get involved with a rare caliber project (does 375 Winchester empty brass come to mind?) prices are whatever the buyer can tolerate. Good luck with your project.

  5. #5
    Boolit Master
    Join Date
    Nov 2012
    New York, the empire State
    Graf still has them made by Starline under contract
    NRA Endowment Member
    International Ammunition Association
    State Rifle and Pistol Association
    New York, the Empire State Where Empires were Won and Lost

  6. #6
    Boolit Master

    skeettx's Avatar
    Join Date
    Jul 2009
    Amarillo, Texas

    For a set of dies there is one currently on auction for $20
    item number 112754076931
    Last edited by skeettx; 01-14-2018 at 10:05 PM.
    NRA Benefactor 2004

  7. #7
    Boolit Master
    Join Date
    Jan 2016
    Decades ago GONRA made 'em (home made dies)
    from .35 Remington rifle brass, then .41 long Colt revolver brass (much better)
    finally got RCBS dies, Midway and FC factory brass cases (best of course).

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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