Process for necking down from 30 caliber to 7mm?

Discussion in 'Reloading' started by Bradu, Aug 31, 2018.

  1. Bradu

    Bradu Member

    Messages:
    12
    Joined:
    Nov 26, 2012
    What is the best way to neck down from 30 caliber to 7mm? I know quite a few people use bushing dies and step down in .010-.012" increments before neck turning but what about the part of the neck that doesn't get sized using a bushing die? I am really considering a 7-300 norma and want to get this figured out before going down that road.
     
  2. jasent

    jasent Well-Known Member

    Messages:
    372
    Joined:
    Nov 16, 2010
    Just need a fl 7-300 Norma die. Easy peezy in one step.
     
  3. AZShooter

    AZShooter Well-Known Member

    Messages:
    2,245
    Joined:
    Dec 12, 2005
    If you have a standard seater die you can use it as your first step to reduce the neck diameter. Then use the FL die.
     
  4. MudRunner2005

    MudRunner2005 Well-Known Member

    Messages:
    12,522
    Joined:
    Oct 13, 2008
    .308 to .284 is a very small jump when sizing down. Like was stated, buy the proper 7-300 Norma die, lube the case necks and run them in the die... Wipe off the case necks... Done.
     
    Bradu likes this.
  5. Bradu

    Bradu Member

    Messages:
    12
    Joined:
    Nov 26, 2012
    I have never heard of this before, just take out the seating stem and run it through? I will give it a try with just a sizing die like the others have mentioned but I'm curious about this method. I'm always willing to learn something new.
     
  6. dok7mm

    dok7mm Well-Known Member

    Messages:
    1,007
    Joined:
    Apr 13, 2015
    I neck down Nosler 8mm brass to form all my 7stw brass. To turn the brass, you need to check the neck I.D. to be sure it's smaller than your turning expander. Also, be mindful to set the die so you don't bump the shoulder back too far, just enough to size all the neck. I prefer the FL Forester die with the stem removed, but with their expander ball location, you can lube inside the neck and use the stem installed. Very little runout involved. Once you get your die set up, the rest is very simple.