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Headspace guage

 
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  #8  
Old 01-22-2011, 09:26 PM
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Location: Mountians of SW NC, near Asheville
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Re: Headspace guage

Since we are only making comparitive measurements (fired vs. sized) any part of the shoulder can serve as well as any other. It's ideal to use the center third of the shoulder but that's not critical.

If you're shooting a bolt rifle you do not need to set the sized shoulders back passed the fired lengths. The fired cases have already shrunk back a thou or two.
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  #9  
Old 01-22-2011, 09:55 PM
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Join Date: May 2007
Location: Alberta, Canada
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Re: Headspace guage

Quote:
Originally Posted by boomtube View Post
Since we are only making comparitive measurements (fired vs. sized) any part of the shoulder can serve as well as any other. It's ideal to use the center third of the shoulder but that's not critical.

If you're shooting a bolt rifle you do not need to set the sized shoulders back passed the fired lengths. The fired cases have already shrunk back a thou or two.

I am assuming then I can just use the fired case to set the sizing die? Measure them, and then adjust the die.

Quote:
Originally Posted by Trickymissfit View Post
I've made a few sleeves to check Weatherby cases in the past. The idea is to draw up the case head in a cad program, and then find the flat part of the shoulder between the radiuses. That will give you the correct I.D. of the sleeve. Then all you need to do is turn one out of aluminum or brass that will clear the total length of the neck plus still seat on the shoulder. What caliber are you shooting?
gary
I load for the following Weatherby rounds

.300
.340
.375
.460
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  #10  
Old 01-23-2011, 04:24 PM
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Location: Mountians of SW NC, near Asheville
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Re: Headspace guage

"I am assuming then I can just use the fired case to set the sizing die? Measure them, and then adjust the die."

Exactly. Fact is, FL sizing pushes the shoulder forward as it squeezes the body diameter down. All we need do is restore the sized shoulder to match the fired dimension and you will be able to chamber the round but will have minumum slop in the fit.

Sizing this way, correctly, reduces case stretch to virtually zilch and head seperations will be rare. I have cases I've reloaded 6-10 times with no sign of a seperation. And I don't load mild.
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