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Checking Runout ?

 
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  #1  
Old 02-02-2009, 08:06 PM
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Checking Runout ?

Hey guys when checking case or bullet runout, are you suppose to divide the dial reading in half to get the true amount runout?

Thanks for the help,
Randy
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  #2  
Old 02-02-2009, 09:21 PM
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Location: MN
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Re: Checking Runout ?

True runout is how much from the center of axis the case neck wobbles so yes you would devide the total wobble by 2. However, true runout matters only to the one shooting the bullet --> if it works it works.
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  #3  
Old 02-02-2009, 10:00 PM
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Re: Checking Runout ?

Quote:
Originally Posted by britz View Post
True runout is how much from the center of axis the case neck wobbles so yes you would devide the total wobble by 2. However, true runout matters only to the one shooting the bullet --> if it works it works.

I just bought this gauge and trying to learn how to use it, I wasn't sure how to read it.

Thanks Britz for the response.
Randy
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  #4  
Old 02-03-2009, 12:14 AM
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Join Date: Oct 2008
Location: Bryan, Tx
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Re: Checking Runout ?

I prefer to sort by total bullet runout. That is the total amount of bullet change where it seats in the cartridge neck. This total runout is the amount of change is ultimately is what will come into contact with the lands of your rifle (hopefully siimulataneously if your bullet has ZERO theoretical runout). Bullets with higher runout at firing have one side of the ogive that contacts the rifling first, thus altering the trajectory of the bullet. I would also bet that bullets with higher runout also have altered vibration cycles (d/t one side of the ogive contacting the rifling first) through the bore. Never heard of anyone testing for this, but it sounds logical.

If you want accuracy, err on the side of total change. Dividing your runout by 2 might give you a false interpretation that your bullet is twice as good as you think it is. Decide what vital zone you need to hit and build your bullets with whatever it takes to hit that zone within your capabilities. If your long distance range is 200 yards, then the deer/coyote is dead regardless of 1 or 2 or even 4 thousandths runout.

Use a rifle range and your data to give you your answer.
TRUST THE SCIENCE!
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  #5  
Old 02-03-2009, 03:12 PM
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Join Date: Oct 2007
Location: Mountians of SW NC, near Asheville
Posts: 1,596
Re: Checking Runout ?

There is Total Indicated Runout, what your indicator shows, and run-out, period, which is half the TIR.

Call it what you want, the handloader's objective is to obtain zero and it matters not how you approach it.
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  #6  
Old 02-03-2009, 05:47 PM
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Join Date: Feb 2007
Posts: 18
Re: Checking Runout ?

Thanks for the response, I will take the indicator reading as what I am looking for.

Thanks again,
Randy
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  #7  
Old 02-03-2009, 09:41 PM
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Join Date: Jan 2007
Posts: 147
Re: Checking Runout ?

Quote:
Originally Posted by bigrack10 View Post
I just bought this gauge and trying to learn how to use it, I wasn't sure how to read it.

Thanks Britz for the response.
Randy
I thougt total runout was multiply to by 2, so if my guage reads .0015" that means it is really is 003" or is it 00075" need help.
Thanks
Elmer
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