The tip of the bullet isn't what touches the lands, it's the ogive of the bullet.
What the book says isn't really as important as what YOUR rifle has told you. Stuffing the bullets into the lands isn't good, unless you do it on purpose.
So Load for your rifle, and don't so much worry about a oal in the book. Depending upon what powder, etc. Having the bullet seated deeper isn't likely to really alter burning rate much. Just watch your velocity, to know where you are in your load range.
Cheers
Bookmarks