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9mm cast bullets tumbleing....

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  • hoytinak

    Active Member
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    Mar 5, 2008
    Texas of course
    I ordered some 9mm lead bullets reloaded them and they are keyholeing in every 9mm I own (6 different ones) from all different ranges. I measured some and they are all .353". Shouldn't lead 9mm bullets be .356"? Would this cause the tumbleing? If that's not it anything ideas on what else it might be? Thanks
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    Mar 17, 2008
    ft hood
    oh...yea that sure would cause it and some good leading I am sure.I cast my own and size .356 and no problems with them keyholing.
    keyholing is caused by
    under sized bullets
    out of round bullets
    pressure being to high
    bullets being to soft

    I make my own alloy of wheelweights and linotype. mixed 9 lbs ww to 1 lb of lino.bhn runs 12-14 bhn.
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