Where can I find reliable loading data for Winchester 473AA, 540 and 571 ball powders for use in popular handgun calibers? I have a quantity of each and would like to find loading tables for their use in handguns.
According to Hodgdon (and I have a letter from Chris Hodgdon to prove it):
W540 is HS6 (Same powder, different packaging)
W571 is HS7
There is not an exact match for the long-gone W473AA, but its burn rate is very close to Universal Clays. It is also a tad slower than SR7625. If you can find data for SR7625, you could use it as a start point.
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