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Thread: Neck sizing -vs- Full Length sizing

  1. #1
    Boolit Man jeepvet's Avatar
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    Neck sizing -vs- Full Length sizing

    I know that it is better to neck size when you can to keep the brass stress to a minimum as long as you are shooting it in the same bolt action rifle. My question is, What about semi auto rifles? If I am going to be shooting the same.308 brass in my AR 10 should I full length size each time due to possible feeding issues if I don't?
    "Nothing is more uncommon than common sense." Benjamin Franklin

  2. #2
    Boolit Master

    nicholst55's Avatar
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    Semi-auto rifles do not do well with neck sized brass. You may get by with it for 1-2 loads, but eventually the rifle will choke on the ammo. Full length size.
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  3. #3
    Boolit Master

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    more important to the ARs and M14/M1as brass is not overly pushing the shoulder back. adjust the sizing die to bump the shoulder back .002-.003 from fired cases. this gives the shoulder clearance to function. Most will allow for the body sized in this manner. A set of redding full length bushing dies will also allow for experimenting with the actual neck tension of the round.

  4. #4
    Boolit Master Tripplebeards's Avatar
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    I only full length size. Neck sizing only in my understanding is for competition target shooting. I've heard neck sized casings get stuck from time to time. Good way to jam up your AR. I eneal my casings every 7 firings or so to keep my brass soft extending the case life. My avatar is from my POF P415 full Length sized at a 100 yards. Don't think I could make it more accurate by neck sizing only and getting stuck casings in the process. I would think in a semi auto you would want to full length size to help feed and function.

  5. #5
    Boolit Master
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    Also to help fit in the Magazine. Fatter brass bodies might cause issues.
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    Boolit Master Tripplebeards's Avatar
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    Quote Originally Posted by krallstar View Post
    Also to help fit in the Magazine. Fatter brass bodies might cause issues.
    .
    Good point

  7. #7
    Boolit Man jeepvet's Avatar
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    I was pretty sure that I needed to full length size for a semi auto but wanted to get some other ideas. I really appreciate all of the comments.
    "Nothing is more uncommon than common sense." Benjamin Franklin

  8. #8
    Boolit Master


    Larry Gibson's Avatar
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    Use a RCBS standard .308W X die to FL size for your AR 10.
    Larry Gibson

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  9. #9
    Boolit Master
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    Neck sizing for a semi can cause problems because they don't have the caming force of a bolt action or some single shots.

  10. #10
    Boolit Master Hick's Avatar
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    I think it depends on the specific rifle and type of rifle. My M1 works fine and I never full length size.
    Hick: Iron sights!

  11. #11
    Boolit Master
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    jeepvet,

    I agree with Hick and let my individual rifle "tell" me when it has enough sizing. I keep all loads labelled and specific for each semi arm. I back off my resizing die 1/8 or 1/4 turn and try the resized case in the arm. I turn the die down in small increments until I get a slight crunch fit, I then lock the die and reload. I do this for my Garands and also did it for three different Match M14s when I was on my state high power rifle team.

    Size just enough for individual arms.

    Adam

  12. #12
    Boolit Master

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    Eventually the rounds are hard to chamber with strictly neck sized. You will have to full length size every 5-6 loadings. Every chamber is different though.

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  13. #13
    Boolit Man fa38's Avatar
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    Quote Originally Posted by Larry Gibson View Post
    Use a RCBS standard .308W X die to FL size for your AR 10.
    Do the case necks have to be under a certain thickness so that the case will not stick in the die?
    Member of: ASSRA, Cast Bullet Assoc., Van Dyne Sportsmen's club, NRA, IHMSA

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  14. #14
    Boolit Master
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    I use the Redding Competition shellholders that come in +.002,+.004,+.006,+.008,+.010, others can be special ordered. Allows establishing minimum working of brass when full-length sizing with shellhoder bumping sizing die. Makes for very consistent sizing. In some rifles, this type of full-length sizing MAY increase accuracy. In my Savage 99 .308's and .300's I find case life increases by 4 or 5 loadings for 'full' loads that chamber without resistance. Most of my rifles chamber easily with the +.006 shellhoder with another at +.008. I do neck size for light loading but after 3 or 4 firings I again full-size to keep everything working smoothly. Regular annealing also in very useful, both for accuracy (bullet pull) and case life. For neck sizing, I find the Lee Collet Die or Redding Neck Size Bushing die easiest on cases. I use the Redding Full-Lentgh Bushing die for my .308 and .223 full-length sizing with the Competition shellholders. Allows one die to work for multiple rifles by changing the shellholders.

  15. #15
    Boolit Master


    Larry Gibson's Avatar
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    Quote Originally Posted by fa38 View Post
    Do the case necks have to be under a certain thickness so that the case will not stick in the die?
    I have not found any problems with varying neck thicknesses from Winchester through various makes of M80.
    Larry Gibson

    “Deficient observation is merely a form of ignorance and responsible for the many morbid notions and foolish ideas prevailing.”
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