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Old September 11, 2013, 08:09 PM   #3
iraiam
Senior Member
 
Join Date: September 6, 2012
Location: Lakewood, CO
Posts: 795
Depends on several factors.

I have seen instances where neck sizing reduced the accuracy of the given load.

The best gains in accuracy I have seen with neck sizing were with belted magnum cartridges, 7mm mag, 300 win mag, 338 win mag. I no longer neck size for my .270 or 30-06 rifle.
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