First off nasem, I wouldn't take it for granted to start off the bat with this load given. I know he has good intentions and all, but it's never a good practice to use a load taken from the 'net you can't verify elsewhere. The other reason is some powders get touchy when they are loaded too lightly. He says to start 10% below a moderate load. This could cause you to measure out too light a charge, and cause problems when fired. Some powders may spike in pressure, others won't get the bullet out of the barrel; too difficult to say which.
What you should do (and I recommend) is call Hornady directly and ask them about this particular bullet to see if they have any load data they can recommend for it. This is all in the name of safety first!