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Thread: .501 magma mold question

  1. #1
    Boolit Master
    Plate plinker's Avatar
    Join Date
    May 2012

    .501 magma mold question

    Is it possible to create and use a double cavity 50 cal mold for the magma master caster? I notice that magma only sells single cavity molds in the 50 cal size. I suspect this is because the pour holes in the sprue plate would not be directly under the stream of lead. Also would the material between the two cavities be too thin to align the cavities with the pour stream?

    I am looking to do a enlarged H&G68 in .501 for the 50GI.

  2. #2
    Vendor Sponsor D Crockett's Avatar
    Join Date
    Feb 2010
    you have answered your own question the bullet is to big to make a 2 cavity mold with and have it work on a Master caster but you can do it with a hand cast set up D Crockett

  3. #3

    Join Date
    Dec 2005
    Oregon Coast
    The other problem would be keeping the mold blocks cool enough. There's really not enough mass in the Magma mold blocks for a two cavity .50 caliber bullet, which is why they make them in single cavity only. You'd have to wait for the alloy to harden before opening the molds, which would really slow down production on a Master Caster or Bullet Master, and pretty much negate the advantages of the machines.

    Hand casting a large bullet allows for more flexibility in the time between pouring and opening the mold. I've had large bullets break in half when they fall from the mold when I rushed the process, and I'm pretty sure most casters of large bullets have found this, too.......

    Hope this helps.

    After a shooting spree, they always want to take the guns away from the people who didn't do it. - William S. Burroughs.

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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