4
4GSR
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Mine measure .280" dia. neck measures .171" thick x .191" long. Mating female die measures 7/16-20 UNF thread.
Edit: forgot to mention, the neck is not round on mine, it is parallel flats. They are Whitley brand.
Edit: forgot to mention, the neck is not round on mine, it is parallel flats. They are Whitley brand.