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Measuring OAL in precision ammo...

 
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  #15  
Old 03-15-2013, 09:02 PM
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Join Date: Jun 2006
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Re: Measuring OAL in precision ammo...

Quote:
Originally Posted by Mikecr View Post
Biggest contributors to bad seating: threaded die/press seating(instead of inline/arbor), and seating force variance/excess seating forces.
True story. Noticed years ago when seating sets of bullets with different powder charges. When the powder started getting crunched, the OAL would lengthen, even with no change to the seating die. Also a smaller ID will lengthen OAL as I'm sure variance in brass elasticity from annealing will change seating depths unless adjusted for.

Comparators are typically (at least all I have measured) .011" below caliber

Here a .308 comparator



and the seating stem (taken from unused RCBS FL seater and measured as close as I could to the first surface to hit bullet) is ~.260"

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  #16  
Old 03-16-2013, 08:31 PM
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Join Date: Oct 2007
Location: Mountians of SW NC, near Asheville
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Re: Measuring OAL in precision ammo...

Richard: "I'll bet you'd be wrong."

I bet you believe that. But I'd bet you're wrong if your normal seating depth is properly chosen, which IS what I said.
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