If there is any doubt, discard the powder. Dupont/IMR made several powders with blue cans. The burn rates are very different. Catastrophic results could occur if you use the wrong data.
If, on the off chance, you have a collectable, really old can of 3031, Sell the empty can to a collector.
Smokeless powder makes an excellent fertilizer. Spread it around the yard and watch the grass grow.