It would be very difficult to fault IMR-3031 as a fuel for the 30/30 WCF, jacketed or cast. That stuff is tough to find around here, even in non-shortage times.
Due to this difficulty, I gravitated years ago toward WW-748 as my 30/30 powder. It works well in 223 and 308, and does good work in the 30/30 with J-words--34.5 grains under the Sierra 150 grain FN, and 32.0 grains behind the 170 grain Sierra FN. There wasn't much to choose from accuracy-wise between the two bullet weights, they both ran about 1.5" to 1.7" at 100 yards using the aperture sight on my Marlin 2/3 magazine 336 variant (from the 1950s, as best I can discern). The 150s clock about 2100 FPS, the 170s run about 1950 FPS.
Of course, I couldn't leave well-enough alone. I got out some Lyman #311291s and #311041s, and prepped 100 cases for a cast bullet 30/30 banquet. One very nice trait I have noticed with my previous 30/30 leverguns--cast bullets can be run near or at the same speeds imparted to their red-coated understudies without much accuracy fall-off. With the Win 94 sold to a friend, this Marlin I bought from Cobb Mtn. Mac (RIP) was in need of a wring-out. Mac showed me some impressive targets he fired with this rifle at 100 yards using his castings.
I loaded 30 rounds each with #311291 and #311041, W-W cases, WLR primers, stair-stepped powder weights of 28.0/29.0/30.0 grains of WW-748. 6 loads/10 rounds each. I couldn't quite match Mac's grouping ability, which was about 1.25 MOA. I did come very close to the rifle's j-word performance, though--average grouping ran 1.8 MOA for the "291", and right around 2.0 MOA for the "041". It was a good day of shooting, much needed by yours truly. I LOVE THIS MARLIN!