Primary extraction is designed to be at the end of the bolt lift. Why not load a dummy round at book length and re seat seat the bullet .005 deeper until the bolt closes rather than making a LNL gauge. I formerly made them, I clamped 2 pieces of poplar in a vice and drilled an appropriate size hole down the splitline. Put a small piece of jar lid gripper around the case and squeezed it slightly so it does not slip and you don't distort the case while drilling. Like Burger King.
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