I had used 3031 in my 358 winchester with some success. Unfortunately I am about out and not sure where to get some. I need to work up a load using 230 grn cast bullets. Target velocity is 1800 fps or so. Powders I have on hand that may fit the bill are IMR 4064, both the H and IMR 4350, and H4895. Also have a bit of winchester 748. Any suggestions where to start? Don't really want to waste a lot of primers experimenting here! I also have Unique, not sure I can safely get that high with it.