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Thread: .358 jdj cases

  1. #1
    Member Mkay's Avatar
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    Default .358 jdj cases

    Any ideas on how to reform 444 Marlin cases to 358 JDJ. Having obvious problems finding 358 JDJ. I have the dies for reloading.
    Thanks
    My child was inmate of the month at Mat-Su pre-trial Correctional facility.

  2. #2
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    I used the 375 JDJ die to get it started. You can probably use a 358 Win or a 356 Win die, if you have those. It takes good lube (imperial) to form cases. The 444 case is .4706" at the base the 358/356 Win is .4709" so that works. The JDJ is longer so don't shove the shoulder back to far. Don't use fired brass. I have made lots of them without annealing them but you may need to.

    There is a forming die for the 375 and that works as an interim step before full sizing to 358 JDJ.The shoulder angle of the 358 JDJ is 18 degrees. If you use the 358 Win die it will give it 20 degrees but that works.

    The best way to do this is a little at a time. Don't stroke the case into the die all at once. A little them back up and screw the die down the try again. Don't over do it as this will give excess shoulder slop and cause the case to fail when fire formed. Form the shoulder until the action just closes on the case.
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    Member Mkay's Avatar
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    Thanks, Bob
    My child was inmate of the month at Mat-Su pre-trial Correctional facility.

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