That tends to depend on brass thickness, along with seating depth in a particular rifle. Have used different brands of .30-06 brass that got basically the same velocity/accuracy with 58 and 60 grains.
One way to reduce the amount of powder needed to achieve the same velocity is to use magnum primers. They'll often result in requiring 1-2 fewer grains.
Have also not found "crunching" to affect ballistic performance much, unless it also results in pushing the bullet forward a day or week or month after seating. Have tested 286-grain 9.3x62 handloads with heavily compressed Big Game powder years after they were loaded, and so far they've always resulted in the same basic velocity and accuracy.
