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headspace question

 
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  #1  
Old 06-15-2012, 10:10 PM
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Join Date: Jun 2012
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headspace question

I'm new to reloading for accuracy instead of cost. I bought a Hornady OAL guage and made an insert with .350" bore to measure the location of the case shoulder. My plan was to measure some fired cases and adjust the decapping/resizing die until it pushed the shoulder back .002".

However, on both my rifles (sako 75 30-06 and sako 85 7mm rem mag) even when i screw the die all the way down all the way to the shell holder (at top of ram stroke) the location of the shoulder doesn't change.

I measured some new winchester 7RM brass and it averaged 2.103"+/- .003 and my fired cases measure 2.120"+/- .001 so i know the cases are expanding i can repeatably measure differences in headspace.

is it possible that the chambers in both guns are short enough that the die doesn't touch the fired cases even when it is all the way down? am i misunderstanding something? photo of my die set and measurement setup:

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  #2  
Old 06-16-2012, 04:40 AM
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Re: headspace question

You need to put this in the gunsmithing or reloading categories
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  #3  
Old 06-17-2012, 08:01 PM
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Re: headspace question

When you die just touches shell holder,sometimes takes a 1/4 turn further down to get result.Your goal will be 2.118''The press will cam over
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Old 06-20-2012, 04:35 AM
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Re: headspace question

The ultimatre test is whether they will chamber with very slight resistance when the brass shoulder touches the chamber shoulder. Its best to do this with the firing pin and cocking piece removed from the bolt.
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Old 06-20-2012, 10:55 AM
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Re: headspace question

Quote:
Originally Posted by sp6x6 View Post
When you die just touches shell holder,sometimes takes a 1/4 turn further down to get result.Your goal will be 2.118''The press will cam over

Yepper! Ease off the ram pressure and run the die in MORE ( 1/4 turn more)...lock the die solid and try it again. Anything after that should be about 1/8 turn but keep "squeezing" the casings and MEASURING
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