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Measuring run-out

 
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  #1  
Old 07-04-2005, 12:27 AM
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Join Date: Jul 2004
Location: U.K
Posts: 10
Measuring run-out

Hi all, new to the reloading for maximum accuracy thingy and have a question how do I measure for run out I have heard it mentioned endless times but nobody gives a full description of what it involves.
Thanks in advance

Leon [img]/ubbthreads/images/graemlins/smile.gif[/img]
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Old 07-04-2005, 06:24 AM
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Join Date: Dec 2001
Location: Potters Hill, NC
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Re: Measuring run-out

Hi Leon,
Welcome. Most people who measure runout of loaded rounds have either the RCBS Case Master Gauging Tool ($64.99) or the Sinclair Concentricity Gauge ($91.50/w Dial Idicator) ($74.90 w/out Dial Indicator) or versions thereof.
Just lay the loaded round in the bullet guide (RCBS) or on the ball-bearings (Sinclair) and slowly rotate the round while the dial indicator is touching the bullet. I usually let the indicator tip touch the bullet about the ogive. You can, however, also use these nifty tools to check runout of cases. For fired cases this would show the trueness and concentricity of your rifles chamber or for re-sized cases would show the same values of you re-sizing die.
I made the one that I use by looking at the Case Master in the RCBS shooting catalog. I used Delron for the base mounting plate and also for the bullet/case guides. Works just fine. My cousin made one using ball bearings and it too works just fine. Hope this helps, as I know of no other way to check for runout, other than rolling the loaded round across a desk top (gotta have a quick eye for that). Good luck. Johnny K.
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Old 07-04-2005, 01:46 PM
dcb dcb is offline
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Join Date: Jun 2004
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Re: Measuring run-out

this is what I use. I know there are less complicated setups but this works for me and covers allmost everything I want to measure
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