RCBS clearance at PSA

Rule of thumb is 0.002" smaller than loaded neck diameter. This may or may not work depending on the brass you are using. Winchester, Federal and Lapua are all different thickness in the case. I get better results with a Lee Full Length Sizer with 308 brass. I only use Redding bushing NECK SIZER dies for my benchrest calibers. I dont own any bushing full length sizers.
 
I actually like to go .003" under bullet diameter, and then use a mandrel expander. This ends up working the brass less than a regular FL sizing die.
 
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