Depends on the die. I had a set of Lee .41 mag and they worked better with a lubed case, every dozen or so passes. ( I have read, probably here, that Lee sizers are sometimes on the tight side) I also have used an occasional lubed case when sizing some brands of 9mm and after shooting near max 44mag loads a little lube helps. Also on 30 carb. (because the instructions say so) It isn't going to hurt anything and if it makes the process go a little easier, why not?
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