When modelling loads through Quickload, the loads with the broadest average/median of the curve usually produces the best accuracy.
The 308 Winchester exhibits this. There are others as well.
Ideally, the powder burn should be optimized at max pressure. With a broad curve the optimization of the powder is less critical as are other factors/variances.
So, to say one is "Intrinsically Accurate" is to say one load is more tolerant to variables than another.
Modelling will take the guess work out of selecting a cartridge, barrel length, and powder.
Field testing will be short with a good model.
