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# Checking Runout ?

#1
02-02-2009, 08:06 PM
 Junior Member Join Date: Feb 2007 Posts: 18
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
#2
02-02-2009, 09:21 PM
 Platinum Member Join Date: Mar 2007 Location: MN Posts: 1,219
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.
__________________
-- Well, at least I try --
#3
02-02-2009, 10:00 PM
 Junior Member Join Date: Feb 2007 Posts: 18
Re: Checking Runout ?

Quote:
 Originally Posted by britz 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
#4
02-03-2009, 12:14 AM
 Silver Member Join Date: Oct 2008 Location: Bryan, Tx Posts: 284
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.

TRUST THE SCIENCE!
#5
02-03-2009, 03:12 PM
 Platinum Member Join Date: Oct 2007 Location: Mountians of SW NC, near Asheville Posts: 1,595
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.
#6
02-03-2009, 05:47 PM
 Junior Member 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
#7
02-03-2009, 09:41 PM
 Silver Member Join Date: Jan 2007 Posts: 164
Re: Checking Runout ?

Quote:
 Originally Posted by bigrack10 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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