Clarkm,
That's why I asked my question! My experience with 17 is it's not nearly as temp-resistant as it was billed as when introduced.
One of the interesting things noticed when 17 first appeared was how many handloaders were reporting magic velocities--when no pressure tested data had yet been published. Then when data was published, those magic loads and velocities weren't included. In fact, some older Alliant powders beat 17's velocity in a number of loads, and newer Alliant powders in a bunch of other loads.
But once a powder gets a reputation for magic, the rep tends to stick.
