+1 with the Lee Manual. Yes it is full of shameless plugs for their equipment. Most of the info applies to most makes and styles of dies and measures, and the load data is a nice wide comparison from all the major brands.

OP, great choice on the 155 A-Max and Varget. That is a winning combo in my 308. Keep working up keeping a close eye for pressure signs. FWIW mine shoots the 155 with 45.0gr of Varget and zero signs of pressure. Remember to keep working up carefully as each barrel is different.