headspace

Discussion in 'Reloading' started by confused fred, Aug 5, 2019.


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  1. confused fred

    confused fred New Member

    Messages:
    1
    Joined:
    Aug 5, 2019
    I shot new cases and got all kinds of different numbers. It has been suggested to shoot 2 or 3 times to settle down.But how far back do i bump and from what measurement do i use to fire a second time if i got all these different headspace numbers?
     
  2. jasent

    jasent Well-Known Member

    Messages:
    537
    Joined:
    Nov 16, 2010
    I just neck size for first 3 loadings. With a fl type sizer just adjust up so it sizes the neck and body with no shoulder bump. Then make sure it chambers
     
  3. lancetkenyon

    lancetkenyon Well-Known Member

    Messages:
    1,902
    Joined:
    Jun 3, 2013
    Make sure you use a decapping die to pop the primer BEFORE you try and measure headspace growth. Effort in futility if you don't. I bet your number variation really shrinks up after you pop primers and remeasure. Even with new brass, I usually only get .001-.002" variation once primers are popped.
    Then bump back .002" from your longest measurement when you FL size, and test fit in your rifle.