I think you can see that the Krag loading data should give you a starting point.
I used the data like I showed you for a starting load for my MN's using a 155 gr cast boolit when I could not find any data for that weight boolit and any powders other than Unique and 2400.
I just used the starting data for the Krag and the 160 gr Cast boolit and have worked up loads fore IMR 4227, RL-7 and IMR 4198 so far.