Interesting results Saturday shooting a .250SavImp with cast RCBS 257-120's. The results of two different powders with all else identical was amazing. The velocity of the two loads were within 12fps of each other(1798 avg.) over (10) shot strings. The SR-4759 shot a 2 1/4" group and the Unique "pattern" was nearly 12", all evenly dispersed. Not sure I will ever understand the theory behind this.