I built a AR10 in 260 Rem and have some Lapua 123 gr Scenar and would like to shoot it with my RL-19 powder. The only data I can find is with N550 which shoots good, but gives me high SDs and ESs. The RL-19 with ELD-Ms gives me the lowest SDs and ESs. I would like to see what the Lapua do with...