ADG 300 WSM brass was designed not only for consistency, but for durability.  One of the ways we accomplished this was adding material to the case in specific areas to strengthen it.  With the additional material, our brass is heavier than most other manufacturers brass and therefore will require lower charge weights to achieve the same pressures and velocities due to the reduced volume inside the brass.  We recommend using a reputable load data source and working up from their recommended minimum starting loads.