need help with 7mm belted cases

Discussion in 'Reloading' started by Darcey, Aug 8, 2011.

  1. Darcey

    Darcey Active Member

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    I need the help of you knowledgeable reloaders please. I shoot a Rem mag 7mm sendero and am reloading . I am new to the belted cases and want to know how I should go about setting up my resizing die to properly form the brass for longest life and best accuracy? I am running a LEE challenger single die press with a lee resizing decapper die. Do I run the brass all the way in or do i just do the neck so I don't bulge the brass above the belt?
     

  2. LewisH

    LewisH Well-Known Member

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  3. noneck180

    noneck180 Well-Known Member

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    size them so you have adequate neck tension and will still chamber..never used Lee dies before..someone will chime in.
     
  4. jimbires

    jimbires Well-Known Member

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    resize these belted cases just like any other case . just set your resizing die up to push the shoulder back .002 or .003 . I've never seen the need for the innovative belted case die shown in the one post above . Jim
     
  5. J E Custom

    J E Custom Well-Known Member

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    There are many different opinions on sizing belted cases and they all have merit because of
    different needs.

    When loading for dangerous game = Full length size and try chambering each round (Safely)
    before going hunting.

    For normal hunting size only enough to chamber easy.

    For the best accuracy and brass life neck size only and leave a small donut at the base of the
    neck to center the neck better in the chamber and work the brass the least.

    This is the way I size belted cases and it works well for me in all uses.

    J E CUSTOM
     
    Last edited: Aug 9, 2011
  6. boomtube

    boomtube Well-Known Member

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    I've sized all bottle neck cases the same, rimmed, rimless and belted, for over fourty years; make 'em fit at the shoulder and you're done.
     
  7. Johnboy

    Johnboy Well-Known Member

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    OK just as most have said,resize them to fit the chamber again.and with the Lee doe all you will need to do is this.

    just run the die in to touch the shell holder.then lub a case to try it.while looking at the case after running it through the die look for a slight ring arould the shoulder.if not their then turn the die in about 1/8 more.now run the case again.look for the slight ring again.do this till the ring appears on the shoulder.it should even have a little dot with the ring around the shoulder.this dot will be from the blow by hole drilled into the die for letting the compresed air out of the die.

    I load with Lee dies and have found this ring to appear on all of my brass.but when the die is adjusted like the directions it will be or show up better.but when the die has been adjusted as said it just means the die is now just bumping the shoulder.but check the case when you think the die is at the sweet spot for just bumping the shoulder back.I even like to take apart my bolt to really feel the case when trying the brass.or to see the bolt fall on its own when testing a resized case the way I mentioned.htis has never failed me yet.but only do it when needed.say after every 4th fireing sine I like to use the Lee collet die with all of my reloading.even for my 300wm belted case.:D
     
  8. Centxshooter

    Centxshooter Well-Known Member

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    I have always setup my RCBS belted cases with a nickle ontop of the holder and then screw down the die until it touches. This sizes the case nicely and leaves the bottom portion to have a better fit in that rifle.
     
  9. 338winmag

    338winmag Well-Known Member

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    Could someone explain in fine detail what this "donut" approach actually. I thought from past threads, you don't want a donut?

    Thanks all.
     
  10. Darcey

    Darcey Active Member

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    Thanx alot for your advise guys. That's why I like this site . You guys aren't all about yourselves and actually help a guy learn. Sure do appreciate it.
     
  11. J E Custom

    J E Custom Well-Known Member

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    What I call the donut is the last part of the neck against the shoulder that has "Not" been sized
    and remains the size of the neck chamber after fire forming.

    In other words If the neck is .300 thousandths long you would size only .280 to .290 and leave
    10 to 20 thousandths UN sized .

    What this does is to assure that the neck is centered to the bore after sizing when chambered.

    J E CUSTOM
     
  12. silvertip-co

    silvertip-co Well-Known Member

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    Exactly.
     
  13. 7 loader

    7 loader Well-Known Member

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    Bommtube said it like it should be done. belted cases are not as hard as we make them. Head space of the sholder or belt. My 7 mag likes me to adjust the die to the shell holder and 1/8 turn out. the die is a lee FL sizer and works just fine.
     
  14. Flare

    Flare Well-Known Member

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    In my rifle I have to full length resize otherwise it will not go back into the chamber. Something to check first.

    Corey