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Thread: What is this in mold?

  1. 08-31-2025, 09:26 PM #1
    pdgoutdoors
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    What is this in mold?

    Anyone know what these dark inclusions are on my MP mold? Only my second time using it. I have 3 others and don’t see it on any of them.


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  2. 08-31-2025, 10:39 PM #2
    ACC
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    Looks like slag that made into the brass extrusion.


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  3. 08-31-2025, 10:52 PM #3
    pdgoutdoors
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    Quote Originally Posted by ACC View Post
    Looks like slag that made into the brass extrusion.


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    Is there any way to remove it and are there any negative effects?


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  4. 08-31-2025, 10:58 PM #4
    M-Tecs
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    Something got on it or its leftover coolant. Try a pencil eraser.
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  5. 09-01-2025, 12:54 AM #5
    jsizemore
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    This may help:

    https://castboolits.gunloads.com/sho...aring-to-Mould

    In post #15 there is reference to another thread that may help also. Good Luck with your growth.
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  6. 09-01-2025, 10:00 AM #6
    mehavey
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    Notwithstanding the possibility of getting rid of the imperfections, the two in the grease grooves
    won't make any difference at all in shooting, and the slight (what appears to be a) void in the
    base ring will be ironed out in sizing.

    Not to worry.... from a practical POV.
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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