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Thread: Magma mold spring?

  1. #1
    Boolit Mold
    Join Date
    Feb 2026
    Posts
    11

    Magma mold spring?

    Hello all,
    I am looking for replacement springs for magma engineering (machine) molds.
    I’m measuring them at 0.068 wire, 0.255 bore (over a 1/4” bolt), about 0.400 OD (goes into a 0.440 pocket) with approximately 0.315 uncompressed height.

    I figured this would be an off the shelf common item.
    I’ve tried various metric die springs (amazon) with no real success.

    Am i missing an easy replacement?
    What have you guys with bullet masters and master casters used?

    Or is this a custom, magma specific spring?

    Thanks !

  2. #2
    Boolit Master
    Join Date
    Aug 2019
    Location
    Tavernier, FL Fredericktown, PA
    Posts
    927
    I have a Magma Master Caster and am trying to figure out where this spring is located. Take a photo of the broken spring. My Master Caster uses only one two cavity mould. I used to have the Bullet Master that used 5 double cavity moulds. This machine was an automatic monster. It turned out a pile of boolits at a time. I eventually sold it.

  3. #3
    Boolit Mold
    Join Date
    Feb 2026
    Posts
    11
    Sorry if i was unclear on what i was meaning.
    I’m after the spring on the bottom of the mold itself. That keeps the sprue plate pressed down on top of the mold. IMG_5753.jpg
    Little one visible on the bottom of the mold in that pic (if i didn’t mess up the pic)

  4. #4
    Boolit Master atfsux's Avatar
    Join Date
    Jun 2009
    Location
    Arizona
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    676
    You can find them here at the new reborn Magma down under.

    https://magmaengineering.com.au/mold-parts
    When democracy becomes tyranny, those of us with rifles still get to vote.

  5. #5
    Boolit Mold
    Join Date
    Feb 2026
    Posts
    11
    I actually contacted them a month ago about mold keys and sprue plates.
    They answered back, said essentially “there will be a very high tariff on anything to the US.”
    I replied, ok, i’d like to order some keys and sprue plates.
    Got nothing back since.
    (They show out of stock on the springs.)

    I was hoping there might be a easily sourced replacement.
    It seems about everything in the machine (bullet master) comes from granger.
    But i can’t seem to find a suitable similar spring.

  6. #6
    Boolit Master
    Join Date
    Aug 2019
    Location
    Tavernier, FL Fredericktown, PA
    Posts
    927
    Steve: I might have one of those springs. When I bought my Master Caster many years ago the previous owner gave me a pile of spare parts and moulds. I will look when I get back to my farm the end of May. Lowes and Ace Hardware have small hardware boxes with various springs. You might find a spring that might work in the meantime.

  7. #7
    Boolit Mold
    Join Date
    Feb 2026
    Posts
    11
    Thank you!
    I appreciate it! But i don’t want to take your only one you have. (Unless you have no use for it.)
    I have other molds i can swap them from if it comes to it.
    The issue is:
    I have a set of 8 molds (.38 cal SWC) for the bullet master that didn’t have sprue plates, bolts, nuts or springs.
    I have been able to source all the other parts and pieces except that infernal little spring.
    I kind of look at springs as wear items and wanted to find a source before i needed them.
    I’ve lurked here forever, finally joined.
    Figured this was the best place to ask.

  8. #8
    Boolit Buddy
    shell70634's Avatar
    Join Date
    Apr 2013
    Location
    SW Louisiana
    Posts
    484
    Try Mcmaster-Carr at https://www.mcmaster.com/.
    I buy odd springs and pins from them for my bullet master
    "EXPERT= Ex is a has been, spurt is a drip under pressure" Unknown

  9. #9
    Boolit Master





    SSGOldfart's Avatar
    Join Date
    Sep 2011
    Location
    East Texas
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    2,508
    Quote Originally Posted by atfsux View Post
    You can find them here at the new reborn Magma down under.

    https://magmaengineering.com.au/mold-parts
    Thanks for this link I could use a few parts myself.
    I started out with nothing and I still have most of it left.
    Paralyzed Veterans of America

    Looking for a Hensly &Gibbs #258 any thing from a two cavity to a 10cavityI found a new one from a member here

  10. #10
    May Liberty Increase!
    Join Date
    Jan 2013
    Location
    In the Hills of Tennessee
    Posts
    445
    This outfit makes molds (with hardware) for Magma machines and may be able to help.
    https://nwesti.com/services.html

  11. #11
    Boolit Mold
    Join Date
    Feb 2026
    Posts
    11
    Thank you!
    I’ll give them a shout.

  12. #12
    Boolit Buddy YoungGun88's Avatar
    Join Date
    Aug 2023
    Location
    Kalifornistan
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    271
    CALL Rim Rock Bullets and ask for Frankie Brown. I've purchased Magma mold hardware(springs, mold keys and sprue plates) from him, as they've needed to get replacement parts since Magma in Arizona folded.
    Shipping things from Australia would be too expensive for their own needs and they had/have parts made.

  13. #13
    Boolit Mold
    Join Date
    Feb 2026
    Posts
    11
    Thanks!
    I got in touch with Mark at New West, he has the correct spring/s.
    Apparently its a real odd ball one.
    I previously ordered sprue plates and mold keys from him, and they were works of art and very reasonable. (I had lost who it was, till you reminded me, thank you Guardian.)
    I’ll keep rim rock in mind also, Thank you! Younggun88
    And thanks all for the assist. Sincerely appreciated!

  14. #14
    Boolit Grand Master
    FergusonTO35's Avatar
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    May 2012
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    Boonesborough, KY
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    On the topic of Magma molds, is it possible to use Lee/Lyman/RCBS handles with them? Or could handles be easily modified?
    Currently casting and loading: .32 Auto, .380 Auto, .38 Special, 9X19, .357 Magnum, .257 Roberts, 6.5 Creedmoor, .30 WCF, .308 WCF, .45-70.

  15. #15
    Boolit Mold
    Join Date
    Feb 2026
    Posts
    11
    FergesonTo35,
    Great question. It hadn’t dawned on me to check.
    So after reading your question, i went out and measured.
    The lee 6 cavity handles i have measure 0.310 thick,
    The magma molds i have measure 0.310 where the keys seat.
    They slide right in, with a few differences.

    The magma mold has a 1/4 bolt that retains the sprue plate.
    The lee handles would have to be modified right where the right retention pin goes in order to go over the bolt.

    The magma molds are held to the keys with #8-32 1” long allen head machine screws.
    Spaced 1.375 on center. (By my calipers).

    Once modifying the lee 6 cavity handles, they couldn’t be used on lee molds anymore, due to cutting away of the right mold retention screw hole.

  16. #16
    Boolit Mold
    Join Date
    Feb 2026
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    11
    Sorry, double tap

  17. #17
    Boolit Grand Master
    FergusonTO35's Avatar
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    May 2012
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    Boonesborough, KY
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    Thanks. The Lee handles are cheap enough to make it worthwhile. I've watched some nice Magma molds go for low money and didn't pull the trigger because I didn't want to get stuck with something I couldn't use and then would have a limited pool of buyers if I resold it.
    Currently casting and loading: .32 Auto, .380 Auto, .38 Special, 9X19, .357 Magnum, .257 Roberts, 6.5 Creedmoor, .30 WCF, .308 WCF, .45-70.

  18. #18
    Boolit Master


    Join Date
    Sep 2007
    Location
    East Texas
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    4,663
    I modified a set of RCBS handles by removing the corner to clear the 1/4” sprue plate screw and I can still use it with RCBS molds.

  19. #19
    Boolit Mold
    Join Date
    Feb 2026
    Posts
    11
    Deltaenterprises,
    I didn’t look at the rcbs ones, but great to know! Mostly have lee with a couple of lyman in there.
    How did you attach them to the magma molds?
    My idea was to remove the keys and cross drill for the 8-32 cap screws.
    But i figure the spacing / angle will be important or ya would have alignment issues.
    Always good to have options!

  20. #20
    Boolit Grand Master
    FergusonTO35's Avatar
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    Quote Originally Posted by deltaenterprizes View Post
    I modified a set of RCBS handles by removing the corner to clear the 1/4” sprue plate screw and I can still use it with RCBS molds.
    Awesome. Are those the two cavity or four cavity RCBS handles? I think my RCBS handles are the four cavity version.
    Currently casting and loading: .32 Auto, .380 Auto, .38 Special, 9X19, .357 Magnum, .257 Roberts, 6.5 Creedmoor, .30 WCF, .308 WCF, .45-70.

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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