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Thread: 350 Remington Magnum from 7mm rem Magnum brass

  1. #1
    Banned
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    Sep 2016
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    350 Remington Magnum from 7mm rem Magnum brass

    I'm just having a hard time finding 350 Remington Magnum Brass. My dad years ago, had his 350 rem mag rifle necked up to shoot 375 bullets.
    Roughly 30 years later, my dad and his hunting buddy are in their mid 80's and they want to do a hunting trip. I have been charged to get their beloved rifles ready.

    Unfortunately, my dad's friend who shoot a factory chamber 350 rem mag cannot find his stash. I will provide the rest of the components.
    I have located everything else other than the brass for his 350. I could maybe run some of my dad's 375/350 rem mag brass to a FL sizer. I found a fairly good amount locally, but the seller wants an all or nothing deal at 2.50 each for once fired and 3 for new unused.

    I'm sure I can run some 7mm rem mag brass on the FL sizer and trim. Has anyone tried this? Any issues?

  2. #2
    Boolit Master

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    Mar 2011
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    You may have to neck turn or ream the reformed cases as they necks may be too thick.

    All depends on brass thickness and how loose the chamber dimensions are.

  3. #3
    Boolit Master
    cabezaverde's Avatar
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    How many are you looking for?
    Founder of the Single Shot section.

    A government big enough to give you everything you want is big enough to take everything you have.


    8 in the 10 ring, then I get a PING. Love my Garand.

  4. #4
    Boolit Mold
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    Mar 2005
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    Alaska
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    I have formed 350 brass from any of the belted magnum cases. The key for me has been trim to length prior to reforming, otherwise I ended up with wrinkles in the shoulder which didn't always come out when fire forming. The necks will need to be reamed or turned before loading. I liked to use nickel plated cases for reforming, so I knew, at a glance, whether it was a reformed case or factory.

  5. #5
    Boolit Mold ATC's Avatar
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    Sep 2015
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    There are videos on youtube on how to make 350 mag brass. Very informative.

  6. #6
    Boolit Master


    GregLaROCHE's Avatar
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    Good luck. Don’t forget to anneal.

  7. #7
    Boolit Master MarkP's Avatar
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    May 2009
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    I have formed 350 Rem Mags from 7 mm Rem Mags.... I need to neck ream the formed cases. Anneal after you have formed them and trimmed them. I made a file type trim die and cut them about 0.060" long with fine tooth hack saw them file close to finished length, chamfer / deburr then use a LEE trimmer to get final length. Anneal necks and body then libe and run thru FL die with expanderball installed. I form with expander ball removed from the die.

  8. #8
    Boolit Master


    GregLaROCHE's Avatar
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    I would anneal before forming and afterwards.

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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