Really hard to go wrong with the Lyman book, but online sources such as Hodgdon.com will usually list cast bullet loads right along with the jacketed loads.
A cast bullet of a certain weight and profile is close enough to any other cast bullet of that weight and profile that you can feel quite secure using the data interchangably. The differences between your gun and the test gun used to create that data are much more significant than any difference between, say, two different 240 gr. LSWCs.
Start low and work up your load just as you normally would.