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Problem with casting .38 SWC

Discussion in 'Casting' started by Mattyb, Jul 3, 2017.

  1. Mattyb

    Mattyb Internet Tough Guy Supporting Member

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    I bought a Lee six-cavity 158 grain SWC tumble lube mold, went through the normal preparation ritual (cleaned it, alcohol, candle smoke, etc...) but about 1/3 of my bullets seem to have a "dent" in the middle of them. The tumble lube groove is still molded in, but it looks like it's collapsed on the side. Is this normal? I cast 230gr LRN tumble lube bullets and don't have this problem from them. Any idea what I am doing wrong?
     
  2. Mike Overlay

    Mike Overlay Lacks seriousness Staff Member Benefactor Charter Life Member

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    Post a pic of an example?
     
  3. Inglis

    Inglis Member

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    Is the mold warm when you are casting?
     
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  4. Mattyb

    Mattyb Internet Tough Guy Supporting Member

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    I cleaned it, smoked it, and started right in on it.
    The mold is warm/very warm depending on how long I have been at it before switching back to .45s.
    I will try the Bic lighter and see if that does the trick.
    I have cast about 250 or so through it.

    Thanks for the advice.
     
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  5. Ikarus1

    Ikarus1 Avtomat Krishna-kov

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    U can always cast good bullets out of whichever cavity is the best, put a screw in the base and lap them with some ajax or baking soda etc. Ive done that with some Lee 2 cavs
     
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  6. John

    John Member Benefactor Charter Life Member

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    It may be some residual oil on the mold. Whatever cutting oil/coolant Lee uses is very persistent. Try hot water and dawn dishwashing liquid, then acetone or brakleen. Smoke it lightly with a lighter, then cast fast enough that you get a light frost on the bullets. That lets you know the mold is good and hot, and hopefully you'll produce good bullets. For reasons I don't understand, some molds have to go thru 2 or 3 heat cycles before they start producing good bullets, so don't give up on it.
     
  7. Ikarus1

    Ikarus1 Avtomat Krishna-kov

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    I clean molds with brake cleaner and it works well. Always have some laying around for cleaning guns anyhow. Advance auto $5 for 2 cans
     
  8. Combat Diver

    Combat Diver Well-Known Member

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    I use mostly Lee molds, I preheat mine on a hot plate next to the pot. I also generally run 2-3 molds at a time. Fill one, set down, open the other. I water drop my boolits into a 5 gal bucket of cold water (towel on bottom). I seperate the boolits after I'm done casting (.357,.41,.44 and .45s)


    CD
     
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  9. Mattyb

    Mattyb Internet Tough Guy Supporting Member

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    So, I re-cleaned the mold with soapy water and brake cleaner, smoked it with just a lighter this time, and went at it again. Everything came out fine after the 3rd or 4th cast.

    Thanks again for the help.
     
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  10. Ikarus1

    Ikarus1 Avtomat Krishna-kov

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    Try using some synthetic 2 cycle oil for lube. It doesnt migrate into cavities when used sparingly