I would call it swager preference. I use pure lead. I don't mind a little bleed by, I never get lead stuck to my punch though. That is the only thing that confuses me on your post. Of course there is a fine line of a little bleed (small amount up the walls) vs. too much (bleeds all the way up and or over the edge of the jacket). I have a whole line of punches though so regardless of the jacket ID I have one that will fit. Of course I use 1 or 2 the most for each caliber and the other linger until needed for a project.
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