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Case length question

Discussion in 'Reloading' started by unicom, Mar 7, 2020.

  1. unicom

    unicom Active Member

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    Since I’m loading 300 blackout for an ar15 should I be doing any kind of crimp


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  2. unicom

    unicom Active Member

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    I’m trying to roll crimp these so they will run in my AR. I have no issue buying just a crimping die like lees factory crimp die if I need. The RCBS die instructions say I can set the die to roll crimp.


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  3. Younggun

    Younggun Ginger Avenger TGT Supporter Admin

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    I don’t.


    YMMV.


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  4. Mike_from_Texas

    Mike_from_Texas Active Member

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    Don’t know if it’s necessary but I crimp mine with a Lee factory crimp die.


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  5. Dawico

    Dawico Uncoiled Lifetime Member

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    This. I don't.

    If you have proper neck tension you won't need it.

    If you must though get a Lee FCD. Perfect case length isn't a concern with how the die works and they are super easy to fine tune to what level of crimp you want.
     
  6. Dawico

    Dawico Uncoiled Lifetime Member

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    Also, generally with boat tail bullets you don't need to bell the case mouth like with handgun rounds. It takes a special die anyways and I only mention it because belling was mentioned earlier.

    With flat based bullets chamfer the inside of the case mouth to get them to start properly.

    The only time you may need to bell case mouths is if you shoot cast bullets.
     
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  7. Younggun

    Younggun Ginger Avenger TGT Supporter Admin

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    Yep, I put a good chamfer on the case mouth and have had no issue with flat base bullets seating properly.


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  8. unicom

    unicom Active Member

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    Cool. Thanks for all the input from everyone. Hopefully I can resize the cases that are over crimped once I pull the bullet and remove the powder. Should I try to remove the primer or just make sure the to back out the de-primer on the sizing die?


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  9. avvidclif

    avvidclif Sturgis '95, RFTW 2010

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    Just back off the depriming pin and don't be over the top of the loader. Wear safety glasses.
     
  10. rotor

    rotor Active Member

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    Wouldn't a Lyman ammo checker take the guess work out of all of this? Just asking.
     


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