Mike, thanks for the data on when that can was used. That seems to correlate with Unclenicks's economic analysis. Both suggest 60's to early '70s.
I have two cans, one opened and one unopened. So I can always compare the contents of the unopened can with the opened can, to confirm contents of the opened can.
So, I may have about $25 worth of usable powder here, and no gun to shoot it in.
May be time to call Hodgdon and see how accurate you prognosticators are.
I am Pro-Rights (on gun issues).