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I think if you screw the die down one full turn (1/14th inch), that'll be too much. The press won't be able to put maximum force on the case pushing it up into the full length sizing die. 1/8th turn down may well be enough. The press lever arm should "cam over" as the ram reaches the top of its stroke when the shell holder stops hard against the die's bottom.
While correctly full length sizing .308 Win. cases has produced the best accuracy with them for decades, until one totally understands the way those cases fit the chamber when fired and how their dimensions change from firing as well as sizing, they may think otherwise.
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