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Thread: Making 375 Nitro Express brass??

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    Boolit Bub ronniet's Avatar
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    Making 375 Nitro Express brass??

    Anyone know what I can make 375 Rimless Nitro Express brass from and what tools/dies I will need to do that?
    Its also call 9.5X57 Mannlicher.
    I have a lot of dies but no 375NE dies but may be I could use some of my larger dies with changed out expander balls to open something up, but will still need to resize it to 375NE size with the shoulder in the correct place.
    Ron

  2. #2
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    C-H makes dies for it, not too pricey but not cheap either, but have bought dies from them and they are definitely worth the $$. You may be able to form from 8 X 57 as the base and rim are the same but the cases will need fire forming to expand shoulder diameter. Brass is available from Bertram but is very expensive.

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    Boolit Buddy fralic76's Avatar
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    Quote Originally Posted by ronniet View Post
    Anyone know what I can make 375 Rimless Nitro Express brass from and what tools/dies I will need to do that?
    Its also call 9.5X57 Mannlicher.
    I have a lot of dies but no 375NE dies but may be I could use some of my larger dies with changed out expander balls to open something up, but will still need to resize it to 375NE size with the shoulder in the correct place.
    Ron
    I just looked in "The handloaders manual of cartridge conversions, Fourth edition" and did not find 375 Rimless Nitro Express.

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    Boolit Bub ronniet's Avatar
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    Yea, its probably listed as a 9.5x57 Mannlicher Shonouer? spelling?
    Ron

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    Last edited by skeettx; Today at 09:13 AM.

  6. #6
    Boolit Bub ronniet's Avatar
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    Yes! thank you

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    Boolit Buddy
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    I make mine from 8x57Mauser for a 1910 Mannlicher Schoenauer. They call it the 9.5x57mm M/S.
    The British gunmakers planted their own cartridge designation on the custom rifles they produced
    in that caliber as the .375 N/E Rimless. (Nitro Express Rimless)
    Sometimes further ID'g the cartridge with a '2 1/4" Case' designation in the line.


    The cartridge is actually a few .000 smaller in dia at the head than the standard x57mm case (or the 30-06 case).
    The 8x56M/S and the 9x56M/S have the same difference in spec.


    But many rifles chambered for it will accept ammunition made from the Mauser brass and '06 brass with no problem. If they won't chamber, then the base dia of the case will need to be turned down those few .000 in dia. I simply spin them in my lathe and with a sharp fine cut file make an educated swipe accross the base. .
    The rim dia of the M/S & the x57Mauser is the same,,don't reduce the rim dia along with the base/head dia.

    I have 9.5x56 dies for loading,,

    You can make do in forming brass by expanding the 8mmMauser up to .400.
    The slowly neck it back down to .375 trying the case as you form the false shoulder till it chambers.

    This works if you have a pile of odd dies available to you to work with in necking up and down.
    Then trim, load and fireform.
    After that neck size only as you have no FL sizer.
    Again,,you need to have that armload of odd dies around to make this work for you.
    Some handloaders do,,some don't.

    If you start buying odd stuff just to make do and cut corners,,my advise is to stop and just go buy a set of dedicated caliber reloading dies.

  8. #8
    Boolit Bub ronniet's Avatar
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    Thanks to all that replied, I think I will do this build and I do have a "pile" of dies , and a bucket of fired 30-06 Commercial brass. I am sure I can make some brass cases.
    Let me ask, can I use a Lee 375 H&H collet die for neck sizing the 375 Nitro? will the body do that or is that die too long? Looking for a cheap way to neck size it with out buying a 375 Nitro sizing die. Maybe a 375 something else? and a Seater Die? something other than a 375 Nitro die? I am going to have to buy the 375 Nitro fl die. that may hurt?
    Ron

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    You got a set of 41 Colt dies? Neck size with that.

    As far as full length sizing, I would full length size with 8x57
    then expand the neck to hold a .375 bullet.

    Then load and shoot, seat the cast bullet out long
    to hold the case back against the bolt.

    Then neck size with 41 colt dies or ??

    yada, yada, yata

    Mike
    Last edited by skeettx; Yesterday at 09:15 PM.

  10. #10
    Boolit Bub ronniet's Avatar
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    Yep, I got 41 colt dies, Mike, I got 8X57 dies too, if I don't have an expander I have made them before to make 401WSL brass from AK brass.
    its a stepped expander.
    Do you think the 0-6 brass would need annealed at the top to form with the 8x57?
    Ron

  11. #11
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    No, and the 06 brass is so plentiful, if you get a few cracks, not an issue
    NRA Benefactor 2004 USAF RET 1971-95

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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