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Has anyone seen or tested for temperature stability of this powder?

I tested two frozen, two room temperature, and two hot (left them on the intake manifold).

The only measurable results I got where the hot ones went about 50fps faster.

I wonder if my method was wrong.
 
My buddy has been using it for a while, and has said it's pretty good, his loads worked up last summer are still working through our winter, and summer again, probably about a 30c variance. I'm hoping it's good as I'm about to start using it too


Regards

Pete