Of the powders in your first post, those suitable for open, as mentioned, are WAC and HS6, but also Silhouette. I liked my Silhouette open loads, but HS6 was easier to get. Precision Delta are a bargain when ordering 2k or more at a time, $89/k for 124 JHP. Pick your bullet, and try all 3 of those powders. You may like one over the other. A recent look at Powder Valley shows a lot of powders are available again.