I don't suppose that they did not include it for the very fact that the recipes are so easily available elsewhere...
I know, because the W231 data is SO hard to find. How did they ever come up with those exotic loads? Not to mention they dont even bother to put the W in front of the 231, nor do they indicate that HP38 is the same powder, or make any reference to it at all for that matter.
Lyman's 49th load data is incomplete and lazy, period. As others have mentioned, it is a good reference for a new reloader, but as a load data manual it is way, way down on the list.