As a relatively new rifle reloader, only about two years now, if the manufacturer of the bullet gives a maximum overall length, that is the number I would use. Period. If I understand bullet seating correctly, one part of it is magazine feeding and chamber feeding and the other part is to give the brass the correct pressure level. Too short and pressure goes up, too long and pressure goes down? Anyone care to comment on pressure levels in cases too long?
Bottom line - Accubond gave you a maximum case length. That should be the maximum in my book.