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Taper Crimp 9MM 380

Discussion in 'Handloading and Reloading' started by Cajun CB, Sep 12, 2009.

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  1. Cajun CB

    Cajun CB Member

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    I am having difficulty in setting the taper crimp on 9 MM and 380 cartridges. Where do you measure the cartridge to determine the amount of crimp? Do you measure at the top of the case and the middle.

    On the 380, I am seeing .371 at the top and .370 on the middle. You can see where the bullet ends.

    Thanks for any help.
     
  2. Marlin 45 carbine

    Marlin 45 carbine Member

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    I use a factory cartridge to set my seat/crimp die. then a LFCD. just a light squeeze. no problems and I load some +P 9mm's for friends and family's pistols.
     
  3. Cajun CB

    Cajun CB Member

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  4. Walkalong

    Walkalong Moderator

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    No need to measure anything. Adjust the crimp die so it just does remove the bell, and maybe a teeny bit more. I need magnification to see my taper crimps on 9MM, .40, & .45. I haven't loaded any .380 in quite some time, but the same goes for it.

    Sample .45 Pic
     
  5. loadedround

    loadedround Member

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    LFCD=Lee Factory Crimp Die
     
  6. rcmodel

    rcmodel Member in memoriam

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    Most reloading manuals have a SAAMI cartridge drawing at the beginning of each caliber chapter.

    It shows the maximum case mouth measurement of a loaded round.

    It is .373" for the .380 ACP, and .380" for the 9mm.

    Your taper crimp should be that or very slightly, .001" - .002" less.

    rc
     
  7. lgbloader

    lgbloader Member

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    Yup.

    LGB
     
  8. zxcvbob

    zxcvbob Member

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    That's what I do too in 9mm and .380, and I load them *hot* with no problems.
     
  9. Cajun CB

    Cajun CB Member

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    Thanks for your help.
     
  10. Steve C

    Steve C Member

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    For jacketed bullets I increase my crimp until there is no more bullet setback when the nose of the bullet is pressed against the edge of bench using thumb pressure. This insure no bullet set back in feeding. Never bothered to measure anything.
     
  11. alfack

    alfack Member

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    The thing is, those calibers headspace on the rim of the case. It's pretty obvious if you have too much crimp. The bullet will look deformed. If you have too little crimp and are over the SAAMI spec, your bullets won't chamber. An easy way to check is with a case gauge. On one side you can check the headspace. On the other you can check to see if it will chamber or is over OAL. I usually will drop a few in a gauge to make sure at first, then go to town when I'm confident the dies are set right.
     
  12. TigerBight

    TigerBight Member

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    +1 lfcd

    +1 for the lee factory crimp die I have even run my factory ammo threw it and helped my factory feed problems on a couple of auto I have.
     
  13. rfwobbly

    rfwobbly Member

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    Exactly.

    To which I can only add that if the round is carefully disassembled using a kinetic hammer, there will be no trace of a crimp ring on the bullet, even if it's a plated lead bullet such as Berry.
     
  14. Walkalong

    Walkalong Moderator

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    is still the wrong solution 99% of the time. Fix the problem so that you don't have to squish the rounds into shape. ;)
     
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