That's a very good question. I am probably not the one to give you a definitive answer because I haven't tried to fully optimize a round to be the tack in a tack driver. Others may have better info. (Gale McMillan are you listening in?) I usually back off .007 to .015 assuming the bullet/case combo will allow it getting that close. Some folks seat the bullet right up to the lands and some even jam it into the lands. I would be very leary of the latter due to unknown effects on pressure.
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