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Neck Tension on Bullet

 
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  #8  
Old 04-22-2013, 11:02 PM
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Location: NC, oceanfront
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Re: Neck Tension on Bullet

Your missing the fact that tension, or grip in this case, is not purely a matter of neck diameter.
It is springback force to area applied.
So to adjust tension you increase area of the bullet -springback squeezed by the neck.
You do this by seating bullets deeper, or adjusting the length of sufficient sizing. This is where bushings provide a great advantage in reloading & load development. You can adjust the length of sizing to your necks.

I measure seating force with a hardened mandrel in every neck before bullet seating. With this, and an adjustment to bushing dies(I use Wilsons), I can match necks. Every single one.
I've seen with minimal sizing that tension does not change with reloading cycles. It's only with excess sizing that reloaders are left with ever changing tension and annealing cycles to alleviate(very poor 'fix').
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  #9  
Old 04-23-2013, 07:49 AM
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Join Date: Apr 2012
Location: California Central Coast
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Re: Neck Tension on Bullet

Consistent annealing
Concentricity
Consistent neck wall thickness

I have a regular schedule for annealing brass, different for each caliber but I try to stick to it.

I now use Lee Collet dies as I get very good concentricity and tension

I turn the necks of pretty much everything.
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