Opinions vary on this but i generally only neck size once they have been fired in my chamber until they start to get tight then i will bump the shoulder back. If your die is set up to full length size now back your die off a full turn maybe two. If you soot the neck with a lighter its easy to see on your neck how far down your sizing. The general rule of thumb is go at least as far as the diameter of your bullet to give proper neck tension on your bullet.
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