run out

Discussion in 'Reloading' started by jeff 300, Jan 10, 2009.

  1. jeff 300

    jeff 300 Well-Known Member

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    I'm get a lot of run out in my case after resizing up 300rum to 338 edge the cases start out with 2-3th after i size them they are 5-8 out. i'm using a co-ax press and redding fl bushing dies
     
  2. Lost creek

    Lost creek Well-Known Member

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    I would not worry about it, i'll bet you will still get good accuracy. When i necked down my 375 rum brass to 338 edge i was getting about 20 thousands runout with 338 rum neck sizing die. The accuracy with that much runout was great. My first group after load development was 3/4 inch at 325 yards. All 100 cases shot shot very good. After the first firing i get very little runout,but in all honesty they do not shoot any better than on mt first firing with a lot of runout. I think a good chamber will make up for a lot of runout. This probably won't be the normal for all rifles, but in my 338 edge runout does not seem to matter
     

  3. BigJakeJ1s

    BigJakeJ1s Well-Known Member

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    I agree, shoot them and then resize and see what your runout is. It is difficult to expand the neck that far uniformly. Have you measured neck thickness on these cases? Non-uniform neck thickness causes uneven spring-back which causes runout too. You may need to turn the necks a bit to restore uniformity.

    Andy
     
  4. Hairtrigger

    Hairtrigger Well-Known Member

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    I check run out when trying to find out why a load will not shoot accurately. Don't check run out when you are happy with a load... it will drive you crazy
     
  5. kraky2

    kraky2 Well-Known Member

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    Jan 6, 2005
    Lost Creek--just curious...does your gun have freebore or are you right near the lands with your loads. I sure find it interesting how so many people swear that .005 runnout turns their tack driver into a shotgun and then we have a gun like yours that drives tacks with ammo that wobbly.
    I've often thought the trip down a good barrel does much to straighten out something bad we reloaders might have done.....and about 95% of accuracy comes from how well a gun likes a bullet/powder/seat depth combo.
     
  6. Lost creek

    Lost creek Well-Known Member

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    kraky1,

    I am using .050 freebore.
     
  7. Michael Eichele

    Michael Eichele Well-Known Member

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    Couldnt have said it better. A little is ok. Alot is bad.

    Fire form the cases then worry about it.