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Sources of load data
Please forgive the noob questions, but searches don't really turn up any answers to this.
One of the books I have read in preparing to try my hand at loading, "Metallic Cartridge Reloading," suggests that the powder maker is the prime source for load data. The author even goes so far as to advise only using load data that comes directly from the powder maker.
And yet several other highly respected loading manuals list loads that are not present in the powder maker's load data. There is even some conflicting data between respected sources sometime.
For example:
There is load data for only three 380 ACP bullets in the Winchester/Hodgdon load data for the use of W231.
There is load data for five 380 bullets in the 49th ed. Lyman Reloading Handbook for use with this powder.
Where does this extra load data come from?
And more important, what is the best criteria for judging whether data is reliable (read safe) or not?
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