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Primer OD

Discussion in 'Shooting Related Threads' started by Pumpman, Mar 3, 2011.

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  1. Pumpman

    Pumpman TS Member

    Joined:
    Jan 10, 2010
    Messages:
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    I have been using Remington primers for years, and now I cannot get them locally. I purchased some Winchester primers and after loading a few found they were not seating as well in my STS hulls. I will need to adjust the machine to seat them more deeply. I am surprised because I never ran into this years ago. What primers are the same OD as the Remingtons? Thanks. Jerry
     
  2. Unknown1

    Unknown1 Well-Known Member

    Joined:
    Nov 5, 2009
    Messages:
    3,402
    It's not the OD that's the problem; it's the shape of the primer and it's slightly greater length that makes them hard to seat. The Remingtons are slightly shorter have a more rounded nose. The plastic in the base of the STS hull conforms to that shape. The longer Winchester primer has a square nose and the plastic in the end of the STS primer tunnel interferes with it.

    Options: You can seat the primers as deep as possible and fire the shell. There should no be as much of a problem after the first reload. OR you can use a #1, an A, a 15/64 or a 5.9mm drill bit to manually ream the STS primer hole to remove some of that plastic. I've tried all of them and prefer the 5.9mm or 15/64. I put the drill bit in a drill press set on slow speed hold the hulls upside down while I ream the primer hole from the outside bottm. Takes only a second or see for each.

    Typically, the Mec and Lee loaders that push the hull down onto the primer with support from the inside will insert non_Remington primers much better than do the P-W loaders that don't give the primer tunnel any internal support. I use a P-W loader and keep a little Lee Load-All close by. I pre-prime a thousand or so Remington hulls at a time with Winchester primers on the Lee then unscrew the primer punch pin from the deprimer of the P-W and run the hulls through pre-primed the first time I reload them

    Maybe these photos from another forum will clarify: <I>Remington Hulls and Non-Remington Primers</I>

    MK
     
  3. locdoc

    locdoc Member

    Joined:
    Jan 29, 1998
    Messages:
    874
    Location:
    Antrim, NH
    Navigate the web address above to issue #4. Therein is an informative article, starting on page 50, about the different measurements of primers as determined by the author.

    YM(measurements)MV

    Doug Whiton, P/W dealer/dist
     
  4. Duck

    Duck Member

    Joined:
    Jan 29, 1998
    Messages:
    572
    Thanks Doug!.
     
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