Just start at the base, even the max has a little bit of fudge factor in it. We've loaded some .204 Ruger past the max and it's not showing signs of overpressure, yet.
Actually if you weigh your bullets not all of them are exactly the same as the box states, don't misunderstand what I mean all the bullets in the box will be the same weight. I have only seen this with cast but I use data that matches the printed weight rather then worrying about the true weight.