This topic contains 5 replies, has 4 voices, and was last updated by  Goodsteel 1 year, 9 months ago.

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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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