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I believe that neck sizing increases case life. True or false??? Like you say, opinions vary.
However, I believe that there is another advantage to neck sizing that re-loaders overlook. The case is fire formed to match your specific rifle. Neck sizing allows the bullet to be centered with the bore therefore (in theory) improving accuracy.
Full length sizing reduces the overall case size and allows it to "rest" at the bottom of the chamber. Therefore, the bullet is miss-aligned with the bore.
Don't know that this has ever been proven but there must be some reason why Bench Rest Shooters only neck size.
 

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Let me amend my previous post #4.
I believe that full length sizing is required for cases that are to be used in Lever & Pump Guns.
Lever & Pump Guns lack the mechanical force of a Bolt Gun therefore chambering problems can occur if the case is neck sized.
JMHO
 
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