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Thread: Possible zinc contamination?

  1. #1
    Boolit Mold 45acp's Avatar
    Join Date
    Dec 2009

    Possible zinc contamination?

    Today when i was going to cast some i got some boolits that had some strange faults.

    I have recently melt down some ww and i wonder if there might have been some zinc weights in there?
    I hope this might been caused from another reason.
    Not all bullets, maybe 30% has some faults.
    No wrinkles that i understand is common with zinc contamination.
    I had the same temperature as i use to (arond 703F, pid controlled).
    The only thing that i can think about is that i heated the mold a bit hotter before casting, (and maybe dropping them a liitle faster than usual.
    What do u think? Will i need to dump my muffins, around 180lb?
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    Last edited by 45acp; 02-21-2020 at 02:46 PM.

  2. #2
    Boolit Grand Master

    Join Date
    Oct 2009
    Have you used that mold before and gotten good bullets? Did you have a slushy oatmeal looking stuff floating on top of the molten lead?

  3. #3
    Boolit Mold 45acp's Avatar
    Join Date
    Dec 2009
    Yes, used before and got excellent bullets.
    Nope, melt looks fine i think, hard to tell since there are very few movies that shows that slurry oatmeal.
    Looks kind of brittle when cooled down in pot after finished session.
    Last edited by 45acp; 02-22-2020 at 04:22 AM.

  4. #4
    Boolit Buddy
    Join Date
    Feb 2016
    Reno NV
    A drop of muratic acid would tell the tail.

  5. #5
    Boolit Mold 45acp's Avatar
    Join Date
    Dec 2009
    Got my answer,,, no zinc.

  6. #6
    Boolit Master

    Join Date
    Feb 2009
    N. E. Ohio
    Add some tin to your mix. That will likely cure your problem.

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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