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People who publish manuals want to sell them, even to customers who have bought one of their previous manuals. In order to do that, the new manuals must have something that the older ones do not. These days, with so many new bullet designs coming out, getting new info into manuals isn't so hard. But, previously, there were a lot of new powders coming out, and data on those was an attraction for repeat customers. I think that has a lot to do with which powders get dropped and which get added.
In a few instances, previously published loads have been found by experience to be bad ideas. "Blue Dot" powder in some .357 Magnum loads in one example. In those situations, there is usually some sort of public posting about the data no longer being recommended.
So, if you do not see anything saying that old data for a particular application has been found to be inadvisable, I think you can just continue to use the old data if there is no new data available.
Of course, when you buy more of the powder, the lot number will probably have changed and that means that you should drop the charge back and work-up again. Besides safety, you may find that the most accurate charge weight has changed when the lot number changed. Or not.
SL1
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