Primer flattening on 1st 9mm reloads

Discussion in 'Handloading and Reloading' started by Harriw, Jun 18, 2019.

  1. ArchAngelCD

    ArchAngelCD Member

    Nov 25, 2006
    Northeast PA, USA
    Welcome to metallic reloading.

    You are now learning why many reloaded will tell you primers are a very bad indicator of pressure. You are misreading what you are seeing, those primers are not flattened. Like said, the corners are still round. The primer will fill the pocket when truly flattened.

    While I'm a huge fan of HS-6 I use it where it will work best. HS-6 preformes ỳ much better at the top end of the pressure curve, not how light you are loading it. I like W231/HP-38 for all but the hottest 9mm ammo I load. Not only are you loading very light you are lessening the pressure further by lengthening the COAL. You are loading way too light for HS-6 IMO.

    HS-6 is a hard to ignite slow ball powder and it benefits from use of a magnum primer. Years ago the people who wrote the load manuals did specify magnum primers with H110/W296, HS-7, HS-6 and the like, even in cartridges like the .38 Special. Today the just tell us to use a standard primer with standard cartridges and magnum primers in magnum cartridges.
    Walkalong and PO2Hammer like this.
  2. Average Joe

    Average Joe Member

    Aug 29, 2005
    Easton, PA
    When your primer is flat, you will know..... it will be like one solid piece of metal, from rim to rim.... Yours, are not anywhere near flat.
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