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.223 & 7mm Mag: FL sizing or Neck only?

Discussion in 'Handloading and Reloading' started by 357SigFan, Nov 8, 2008.

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  1. 357SigFan

    357SigFan Member

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    Which is really better? I've heard it said that you can increase accuracy if you neck size only vs full length sizing. I've been FL sizing my .223's, and just bought a BAR in 7mm, which I'll end up reloading for. I noticed that the casings fired from the BAR are about .013" larger just below the shoulder than they where prior to being fired. Found something similar with my .223's (while the difference was smaller, it was noticable). Should I switch over to neck sizing the .223's (which are being fired from an AR15), and only neck size the 7mm? Given the difference between the factory vs fired with the 7mm, I can see how neck sizing only could extend case life...
     
  2. 243winxb

    243winxb Member

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    Full length Resize for Autos, Pumps, Lever action

    http://www.rcbs.com/questions/faq.aspx
     
  3. GooseGestapo

    GooseGestapo Member

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    I prefer to go with the FL dies for anything except match grade Bolt-actions.

    With both of these cartridges, I rely on range-pickups for brass, so FL sizing is the only option. There are wide ranges in the chamber diminsions on both of these cartridges, so you'll likely need to full length size. Especially for the BAR. I doubt that you'll be able to tell the difference in accuracy between full length and necksized ammo. Even with a Rem.700 in .22-250 that will shoot one-hole groups, I'm hard pressed to tell the difference in accuracy between ammo sized in the full lenght die and the Lee Collet neck- sizing die.

    Once sized to fit the rifle, I'll back off the FL- die to where the shoulder is just kissed or only slightly pushed back for easier chambering and better accuracy, but positive chambering in my auto's and lever actions.

    With anything except an exceptionally accurate bolt action, you're going to be better off full-length sizing.
     
  4. 243winxb

    243winxb Member

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    Most Full lenght resizing dies will work just fine in an auto loader.
     
  5. rcmodel

    rcmodel Member in memoriam

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    I would not recommend neck-sizing for either an AR-15, or a Browning BAR.
    Auto-loaders you know!

    Get full-length dies and don't worry about it.

    BTW: NO, you do not need small base dies, in case your were going to get around to asking!
     
  6. 357SigFan

    357SigFan Member

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    Thanks for the input; the funny thing is when I bought my .223 FL die set at Grafs (a year or more ago), the person there said you should neck size for an autoloader (something about being a gas operated semi), and thet FL was usually used for bolt guns. I got the FL dies becasue that's what my grandfather has used with no issues (although his only .223 is a TC pistol).
     
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