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Concentricity

 
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  #8  
Old 09-29-2004, 12:57 PM
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Join Date: Sep 2004
Location: Texas
Posts: 22
Re: Concentricity

Thats good to know.
I can send a blank to the same gunsmith that rebarreled, and he could use the reamer he cut the chamber with. [img]images/icons/grin.gif[/img]
I'm thinking about getting one of those generic caliber decapping dies that decap without sizing,
Then I could full length size without the decapping rod or expander ball in the die.
Then neck size and seat with in-line hand tools.
That's a lot of steps but not trying to have so many things locked into alignment to accomplish one step for everything might give me th eguage flat line. Might shrink the groups too. [img]images/icons/cool.gif[/img]
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  #9  
Old 09-29-2004, 09:58 PM
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Join Date: Jan 2004
Location: New Castle colorado
Posts: 791
Re: Concentricity

Great topic. I got a concentricity guage this summer for the first time. I was unpleasantly surprised at the amount of runout I was getting in some calibers, although the rifles shoot well. My Cooper 22-250 pretty consistently shoots in the mid .3's, and runout of rounds loaded in Redding competetion dies runs only .001 - .002. A tech at Sinclair offered his opinion that runout gets way too much credit for both good or bad accuracy in all but bench rifles. So, I did a little testing with a Kimber .243 firing segregated rounds with from .001 to .006 runout. I found no difference in accuracy in this instance. Seating depth and powder charge weight have thus far proved to have far more effect in this rifle.
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  #10  
Old 09-29-2004, 11:46 PM
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Join Date: Sep 2004
Location: Texas
Posts: 22
Re: Concentricity

yep, a flat line on the guage is what I'd like to see. That way I would know my groups size was being controlled by other things.
Where do people buy the in line seaters in various calibers? I see them at Midway in 300 win mag for example but not in 6.5-06?
I know the benchrest competitors use some really far out calibers, they must be getting them somewhere?

[ 09-29-2004: Message edited by: StrayDog ]
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  #11  
Old 10-06-2004, 09:27 AM
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Join Date: Dec 2003
Location: South Carolina
Posts: 35
Re: Concentricity

Straydog, I don't use a concentricity gauge, but I did take the expander ball out of my dies. I deprime my .308 brass using a .300 WM die, and took the expander assembly out of the .308 die. The targets told me that it helped enough to make a difference.
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