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40/357sig size?

Discussion in 'Reloading' started by 10head, Mar 8, 2011.

  1. 10head


    Dec 26, 2005
    making a order for sig brass(starline) and a review said he used a 40 size die for the body and then a sig die for neck, i have not seen this before anybody else do this and why.
  2. PCJim

    PCJim Senior Member

    Aug 4, 2008
    The 357Sig case is basically a 40S&W case necked down to hold a 9mm bullet. From what I understand, only one manufacturer, Dillon, makes a 357Sig carbide resizing die and it is not cheap (I use Lee). Many reloaders use a 40S&W carbide resizing die to resize the main body of the brass without having to use a case lube, then use the 357Sig resizer for proper setback of the shoulder and to resize the mouth.
    Last edited: Mar 8, 2011

  3. sellersm

    sellersm disciplinare

    May 28, 2009
    I do what PCJim said -- size first with the 40 S&W and then again with the 357sig die. Don't need to lube the case that way.

    You can do it with just the 357sig die, but you'll want to lube it a bit first.
  4. fredj338


    Dec 22, 2004
    Yep, the only way to fly is Dillon for carbides sizers. Wierd, Lee could put a carbide ring in their 357sig die just as easily as the 40. So using the 40 die is vaible, but adds a step as you must use the 357sig sizer to set the shoulder & reform the neck. It's a low pressure job at that point, no case lube needed.