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How to Deprime and Size Berdan Brass

Discussion in 'Handloading and Reloading' started by maq, Apr 19, 2013.

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  1. maq

    maq Member

    May 3, 2012
    North Dallas
    I finally started reloading Berdan Primed 7.5x55 brass. I always heard it was too hard to deprime and size so I never really took the time to think about it. It's not that much trouble. It just took a little time and a little thinking and a little looking.

    To deprime easily you need to build a "hydro - deprimer". Take a 6ft piece of 2x8 or 2x10. Cut the Board into three pieces two feet long. Nail or screw two ends to a 2 foot piece making a bench.

    Now Drill a hole a little larger then the size of the Cartridge you want to deprime about 1/3 way to 1/2 way through the top board..If you drill the hole too deep it will be hard to get the wet cartridge out of the hole. Now drill another hole in the middle of the hole you just made, all the way through the board, just slightly larger than the primer. Place a 5 gal bucket underneath the "depriming bench" to collect the water and primers.

    Take out the sizer bar from a lee or other inexpensive die. For my 7.5x55 that's a 308 which obviously works for several different size cases. Remove the pin. Dump the cartridges you want to deprime in a bowl, small bucket or container of water.

    Take one cartridge out at a time completely filled with water and place in the hole that you have made that is slightly larger than the size of the cartridge. Place the sizer bar from a sizing die with pin removed, inside the edge of the cartridge case and hit with a hammer with moderate force. The primer will pop out easily!! With a little practice you'll get very fast at this. Almost as fast as the standard method for boxer primers.

    Dry the cartridges then check the flash hole for patency and uniformity. You can open the hole with a safety pin if it is not patent or uniform.

    The primer is out, the brass is dry, the flash hole is examined and the cartridge is ready to size in the normal way except the pin must be removed from the sizing bar.

    Trim to appropriate length and now your cartridges are ready for reloading with berdan primers.

    Last edited: Apr 19, 2013
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