concentric ammo and velocity

Discussion in 'Reloading' started by jmason, Oct 28, 2008.

  1. jmason

    jmason Well-Known Member

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    Within a week I will answer this question myself for my specific situation but wanted to here the experiences of others too. My question is;
    does non-concentric ammo have an effect on the ES of a given load?

    I just got a concentricity gauge and checked some loaded ammo. Holy Moly is it crooked! Check some fired brass, as well as brass I ran through the new LEE collet neck sizer I got and looks OK. Man the stuff I loaded prior is bad though.
     
  2. boomtube

    boomtube Well-Known Member

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    "does non-concentric ammo have an effect on the ES of a given load?"

    Doubt you will see a bit of difference in speeds.
     

  3. goodgrouper

    goodgrouper Well-Known Member

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    I think it could but it would be dang hard to measure without some really technical tools. Since barrels are not bored perfectly in the center of the steel and do have some wobble in them, if your ammo has bad concentricity too, it could change how the bullet enters the bore and other minute aspects of the barrel could indeed change the ES unless you meausured and indexed each round before firing. This is, again, very hard to determine and would require a lot of other variables be eliminated to test it and some of those variables would be difficult if not impossible to eliminate so I'm afraid this theory will remain armchair theory at best. That is why we must make our ammo as close to perfect as possible to try and achieve perfection and cross our fingers we got a good barrel! And there would certainly be other variables in our ammunition that would affect the ES to a much more severe degree.
     
  4. jmason

    jmason Well-Known Member

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    I appreciate the help guys!