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Thread: Modify common shell holders to fit proprietary Hornaday case trimmer

  1. #1
    Boolit Master
    Join Date
    Nov 2011
    Posts
    192

    Modify common shell holders to fit proprietary Hornaday case trimmer

    Cross posted to another site, did a search here but did not find a dupe...
    Those of us with a Hornaday trimmer found out/know they have a proprietary shaft size requiring shell holders with a larger hole (Hornaday of course) than other standard shell holders, which are too hard to be drilled. Today I was wondering how to use a Lee shell holder, and did not want to order a Hornaday. Duhhhhh....why hot heat it to draw the temper? Heated the Lee to red with a propane torch, let cool, and drilled it easily. I'm probably the last guy to figure this out, but there may be one other out there.

  2. #2
    Boolit Master

    Join Date
    Mar 2013
    Location
    Northwest Ohio
    Posts
    8,857
    Even easier is order up a die makers carbide drill and drill it out leaving it hard. A solid carbide drill will cut these and not be an issue.

  3. #3
    Boolit Master

    Join Date
    Feb 2010
    Location
    Arkansas
    Posts
    1,475
    There's a similar issue with using the Lee shell holders on the RCBS priming tool. The chamfer underneath isn't big enough, and it crushes the plastic insert.

    I chuck them in my mini lathe and use a Dremel with triangular stone to open them up.

  4. #4
    Boolit Man

    ambergrifleman's Avatar
    Join Date
    Apr 2006
    Location
    Southern OHio
    Posts
    97
    Order You a 8mm carbide drill. I used one to modify a lot of my Lee Shellholders to fit my Hornady Trimmer.

  5. #5
    Boolit Master
    Join Date
    Dec 2011
    Location
    Southwest MO.
    Posts
    1,684
    Personally I doubt they need to be that hard. But if you thought so it's pretty simple to heat it to non magnetic and quench.
    Some people live and learn but I mostly just live

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
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HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
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LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
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