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Old November 18, 2012, 06:38 PM   #5
Brian Pfleuger
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Join Date: June 25, 2008
Location: Central, Southern NY, USA
Posts: 18,791
Quote:
Originally Posted by 1stmar
The presumption is, it sizes from the inside where a bushing sizes from the outside and will be much more influential on neck tension due to brass thickness. I have nothing to substantiate this, just theory.
You and I don't but plenty of people do, and the presumption is correct.

It's not just neck tension either. Expander plugs being pulled out of unsupported necks also tend to pull the neck offline. The collet doesn't pull the neck off-center, which helps make more concentric ammo.
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