Each different area of the country we live could pose different problems for us in the storage of powder. I do not doubt your results. But personally I store large quantities of Triple Seven, Pyrodex, Goex, and other powders and never had a problem with the powder going bad.

When you sighted in the rifle was there an extreme temperature difference between then and what you hunt in? Could it possible be bad primers? Again, I have lots of primers and never had them go bad.

I would take that Triple Seven and do some extensive range testing with it when weather permits. It would be interesting to know. At least you recovered the doe.

And I will add, if you want pure consistency in powders, long shelf life, and easy ignition.. its hard to beat good old black powder.