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Unfortunately Lee did the same thing between revisions.It is not so much an issue of a minimum charge weight, rather it is a matter of volume, the reason that some pistol / shotgun powders such as Red Dot, 2400 and some others are more suitable for using in cartridges for reduced loads is the amount of space they occupy in the case due to their bulky nature.
Even then some powders such as 2400 which have been old standards for decades in cast bullet circles have been removed from the data of many cartridges in the latest Lyman cast bullet handbook not because they are unsafe but because in our current litigious day and age , there is too much room and the potential exists for an overcharge .
To put it more simply Lyman is attempting to protect themselves from a liability suit.