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I called today again and they told me that the powders are a secret.
Fair enogh! I had to ask. I found another box stashed away. I'll pull one apart, to have a guess at it, but it is mute nonetheless... I doubt I'm good enough to guess...
Measure the velocity and the charge weight. Then look up whatever powders meet that velocity at that charge in a load manual. That should narrow it down quite a bit.