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Reloading Berger Bullets

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Concentricity

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  #8  
Unread 02-11-2011, 08:36 PM
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Re: Concentricity

Yeah, your ammo is straight when it measures so on this Sinclair(or effective similar):
SINCLAIR INTERNATIONAL : Sinclair Concentricity Gage -

They marchandise it as a concentricity gage. Sounds sexier I guess..
But it doesn't measure concentricity, or eccentricity.
It's a runout indicator.
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  •   #9  
    Unread 02-12-2011, 01:18 PM
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    Re: Concentricity

    people sure love to see those low numbers. if the machine design masks the run out then the low number doesn't mean anything. it just gives people what they want to see . +1 mike. it also depends on where you take your measurements. run out is always greater further down the bullet.
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      #10  
    Unread 02-13-2011, 03:15 PM
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    Re: Concentricity

    Quote:
    Originally Posted by nheninge View Post
    it also depends on where you take your measurements. run out is always greater further down the bullet.
    Depends on where the cartridge is supported when you are making the measurement. Some gauges support near the head and near the tip of the bullet. In that case, measuring near the middle between them will give you the largest reading for a given amount of "crookedness". If the cartridge is supported at both ends of the body (below the shoulder) then, yes, further out on the bullet gives larger readings. Beware of trying to compare measurements from two people with different setups.

    Andy
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      #11  
    Unread 02-13-2011, 07:17 PM
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    Re: Concentricity

    Quote:
    Originally Posted by BigJakeJ1s View Post
    Some gauges support near the head and near the tip of the bullet. In that case, measuring near the middle between them will give you the largest reading for a given amount of "crookedness
    This is true of actual 'concentricity' gages. But you might notice that they typically indicate nearest support of the bullet tip, which provides only a portion of 'crookedness'..
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      #12  
    Unread 02-16-2011, 11:52 AM
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    Re: Concentricity

    I fell for it too, the hornady gage is cool but not all that practical.

    Buy the Sinclar or make your own with some bb's or V holders.

    Better yet, you have half of what you need on the Hornady already, just add some v holders to it and reverse the concave head holder to the flat side for your end stop......I have a new mission

    Scope rings almost work....I'll find something laying around here to mount to it.
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      #13  
    Unread 02-16-2011, 10:15 PM
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    Re: Concentricity

    So is the Hornady even worth having or did I completely waste my money? And is it really a good idea to use it to "straighten" cartridges. It seems like when correcting the run-out with that thing you may cause more distortion in areas you aren't measuring and make your load worse even though the gauge says otherwise. Any thoughts?
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      #14  
    Unread 02-16-2011, 10:40 PM
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    Re: Concentricity

    waste of money IMHO. Build them right from the start.
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