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    • #47735
      uber7mm
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      I’ve been noticing that I get an occasional slump or void in my 9mm castings either just above the base or just above the grease groove.  What I find strange, is that the bases of these deformed bullets are fulling the mold.  The mold in question is a double cavity steel Lyman 356402 truncated cone.  The problem seems to occur when the mold is up to temperature.  Also the problem is intermittent as far as I can tell.  Does anyone know the root cause of this problem, and moreover the cure?  Please advise.

       

      Thank you and regards,

      Charlie.

    • #47736
      Harter
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      I see that in cold mould rifle bullets in AL mould and sometimes in FE .

    • #47737
      chutesnreloads
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      Yep…..get your mold and maybe your melt hotter

    • #47744
      Goodsteel
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      You’re trapping air in the mold. Try slowing your stream, angling your attack on the hole, and heating up your mold. That should fix it.</p>

    • #48867
      uber7mm
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      GoodSteel:  You were correct.  The slumping issue was solved by allowing a gap of 1/2″ from the stream (bottom pour pot) to the mold sprue.    Thank you for your insight and generosity of your knowledge base.

      Again, thank you for your advice.

       

      Uber

       

    • #48945
      Goodsteel
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      Now that looks like some good bullets!!!

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