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How much crimp on target 357 loads (38s in 357 cases)

Discussion in 'Handloading and Reloading' started by Macchina, Apr 2, 2012.

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  1. Macchina

    Macchina Member

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    I'm loading 158 grain hard cast bullets over 4 grains of 231 in .357 magnum cases. The bullets have a nice crimp groove. How much crimp should I be putting on these guys? I use the 4-die Lee set and usually crimp my magnum rounds tightly.
     
  2. Fishslayer

    Fishslayer Member

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    I would use very light (if any) taper crimp. Just enough to be sure the flare is gone.

    You don't need to worry about jumping crimp in those light loads & W231 doesn't really need a crimp to burn.

    And your brass will last longer. ;)
     
  3. ColtPythonElite

    ColtPythonElite Member

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    Another light crimper here, too.
     
  4. joneb

    joneb Member

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    I have been loading 38spl with 158gr LSWC with 4.2gr of W-231 with a mid to heavy crimp with very good accuracy. But I trim my cases so a heavier crimp is not a issue for me.
     
  5. ArchAngelCD

    ArchAngelCD Member

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    I would use the same amount of crimp you use on your .38 Special loads. Just because you're loading in .357 Magnum brass doesn't change the fact you're really loading a .38 Special.

    I use a light roll crimp on all my .38 Special rounds and that works well for me...
     
  6. Walkalong

    Walkalong Moderator

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    Agreed, use the crimp groove as designed, just don't get carried away with the amount of crimp. Something like this.


    Medium Roll Crimp on a D&J 125 Gr RFN - Using a Hornady seater to seat and crimp in one step.

    [​IMG]
     
  7. Macchina

    Macchina Member

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    Any problem with a tight crimp like I use on my magnum loads? I loaded a few up that way before I thought that I may want to give light loads less of a crimp...
     
  8. Macchina

    Macchina Member

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    Also, thanks for the picture. A picture of a crimp is worth more than a paragraph trying to explain it!
     
  9. Walkalong

    Walkalong Moderator

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    It won't hurt a thing.
     
  10. sirsloop

    sirsloop Member

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    IMHO crimp em light... no need to work over your brass too much. I dont think there's issues with the bullets moving until you get into some max loads or larger calibers. I guess it depends on what you are shooting it outta too... light gun will put more G's on the bullet.
     
  11. 4895

    4895 Member

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    I agree with a light crimp and saving the work on the brass. If you ever want to try different bullets, consider moly coated. I get less smoke and very little fouling with 4.2 grains of W-231 and 158 grain rnfp from Bear Creek Supply bullets in 38 special. I haven't tried them in .357 but would expect the same performance at medium velocities. I shot quite a few Missouri bullet company lead and was pleased, but indoors I would get a lot of lube smoke and a headache from poor ventilation. I haven't had those problems with moly at all. I keep the plain lead for outdoors only now.
     
  12. ArchAngelCD

    ArchAngelCD Member

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    Other than overwork your brass for no good reason...
     
  13. Walkalong

    Walkalong Moderator

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    Tis true. :)
     
  14. joneb

    joneb Member

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    I find a mid to heavy crimp has little effect on the case life of my revolver brass. I have split more 45acp cases that have very little to no crimp do to hot loads
     
  15. Hondo 60
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    Hondo 60 Member

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    Walkalong's crimp looks very good.

    Too light & you run the risk of unburned powder.
    Too heavy & you reduce the life of the brass - you run the risk of the case mouth cracking or splitting.
     
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