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Any experience with the LEE U-die?

Discussion in '10mm Reloading Forum' started by MustangGreg66, Nov 6, 2010.

  1. MustangGreg66


    Mar 16, 2008
    Hello all. I'm relatively new to loading for the 10mm. I started my loading career with .40 minor for production division competition and after having my gun choke on some "glocked" brass I got the U-die. That's what's setup in my dillion at the moment and I was wondering if anyone has used it to load 10mm. I was thinking to just move my seater and crimp dies up a bit (redding competition seater and Lee adjustable crimp die) and the only die I'd actually have to take out of the toolhead is the powder die to adjust it to the longer length.

    Anyway, the U-die will squeeze the case a bit smaller. Has anyone used it for 10mm and had any problems with case life?
  2. _The_Shadow

    _The_Shadow Ret. Fireman

    Jul 23, 2007
    Southeast, LoUiSiAna
    Recently I aquired a supply of brass shot from the H&K MP-5 10mm, they almost all had the case bulge very low on the caseing body, these guns are some what rough on the brass, out of 1350 pieces I found 45 that were split either prior to or after complete sizing,

    This complete sizing was done with the LEE Factory Crimp Die(FCD) removing the seater plug and the inner sizing ring I used only the carbide sizer made into the die body, and used the bullet pusher(part of the LEE Bulge Buster Kit) from a LEE bullet sizer kit which fits in place of the shell holder to push lightly lubed cases up and thru this arrangement as a PASS THRU DIE, this completely re sized these cases. They will pass the 10mm Cartridge Case Gauge without any problems.

    Anyway the brass is reconditioned now and ready to run the loading process.

    BTW I do this with all 40S&W and 10mm Brass I pick up from ranges...Why? Because I demand that I achieve 100% reliability in feeding, function and this adds to uniformity as well!

    Best regards!

  3. MustangGreg66


    Mar 16, 2008
    Nice. I've heard of that tip before and I have the U-die but not the pusher. For .40 I chose the U-die instead of adding an extra step to my reloading and so far it's worked. I stopped guaging my reloads after the U-die and I havn't had any malfunctions.

    I tried some test loads with the 10mm and noticed, just like with the .40, that it really squeezes the rounds down in diameter.

    I need to find some more 10mm brass as well, so far I'm just running some FC I got with the pistol I bought and I havn't dropped the hammer on some starline brass....