Trickymissfit
Well-Known Member
Just a note on turning FL size dies 1/8th of a turn; that is a change of almost 9 thou. Normal headspace tolerance for bottle neck cases runs about 6-7 thou, max, so you could easily go from not quite enough shoulder set back to a good bit too much in a single step.
I told him 1/8th of a turn to get him close to the headspace number. The case will be junk when he's done. When he goes from the bolt failing to close to where it closes he should still be within .005", and that's going to be close enough right now. If he were actually setting up the dies to size the case he might be moving 1/16 of a turn or even less with a shim or two.. The real thing he's trying to gain is the actual overall length of the case to find out if he has a number one or a number two chamber. But a reasonably close shoulder deminsion is a must before going further. My bet's on the number two.
Might add that even though most die manufacturers tell you to move the die in 1/16th of a turn increments; it's really too coarse of a move, and often there's .003 to .005" slop in the threads as well as flex in the lock rings.
gary