It's called a "shellholder" bolt head. I made one from an old .223 bolthead, fashioned just like a shell holder for a reloading press.
I load 12 gr. of bullseye, topped off with cornmeal and then a wax plug. Slide the case into the shellholder bolt head and pull the trigger. The cases come out to the exact same length as the headspace gauge, and the shoulder is just as sharp as a factory case.
I have always found it is better to blow the kinks out of the cases before you turn the necks, it eliminates the donut problem.
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