I will double down on what others have said, that it’s not likely to be the original container. What reason would the owner peel off the front label if the powder is still in it’s original container? I think the batch number on the back may lead you astray.
Go back to it’s original owner and press for better information.. if they can’t confirm without a doubt what it is, save it for guy fawkes and burn something, or go with the tying a rifle to a tree option. Also video it please, I’d like to see that experiment!
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