What kind of action are you building on ?
Is it long enough for the Roberts ? The souper is prety cool, But so is the savage. In a modern action it can do prety darn well.
Sammi load data for ther savage is 46000 cup I think, so you can start at max if you are using say a model 7 remington.
One cool thing about the savage is it doesn.t take much powder to to a prety powerfull load.
All would be fun ...tj3006