.223 neck tension?

Discussion in 'Reloading Forum (All Calibers)' started by mousegunner, Oct 21, 2019.

  1. mousegunner

    mousegunner

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    I'm loading some 55 Hornady FMJs into Speer once fired brass. Necks measure .244 before seating then .248 with a bullet seated (.004 difference) Does this sound right? I want to say my Win cases and match bullets had a difference of .002 but don't have any right now to compare. Bullets are nice and tight and don't push in easily. Just plinking ammo, 1 moa, just leave it and not overthink it?
     
  2. Uncle Ed

    Uncle Ed

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    Below is a Lyman type "M" expander that is .003 smaller than bullet diameter that gives more bullet grip. I use this expander with my AR15 loads with a slight taper crimp for feeding. The case mouth is bumped slightly onto the .226 section and the bullets can be started into the case mouth with only your fingers. This reduces neck runout and any bullet tilt during seating.

    Also Whidden custom dies sells expander kits with five expanders from bullet diameter to .004 under bullet diameter. I also think I read somewhere that David Tubbs is now using .004 neck tension.

    [​IMG]
     
  3. NZ_Fclass

    NZ_Fclass

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    Seems about right. I use a Redding .247 bush for match ammo which gives me 4 thou tension on Australian ADI brass. Load is 24.8 of Varget. Br4 primer. Touching the lands.
     
  4. PatMiles

    PatMiles Gold $$ Contributor

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    .004" is the generally called for neck tension for a semi-auto fed rifle if that's what you're feeding.
     
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  5. 243winxb

    243winxb

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    Military minimum bullet pull is 35 pounds. This is about .002" neck tension, but at times, is not enough when loading fired brass from different makers.
    Your good at .004"

    The expander can be hard to pull thru the sized necks with standard dies. Donuts. A bushing die works better, as it doesnt size all the way to the neck shoulder junction.

    [​IMG]
    A great photo from AMP Annealing Co.
     
    Last edited: Oct 22, 2019
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  6. 243winxb

    243winxb

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    Federal bullet pull. Screenshot_20191025-212549.jpg
     

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