I was almost out of powder for 9mm & 40 cal handguns, and last week I bought an almost full can of Hercules Unique at a garage sale. Not sure how old it is. Bottom is stamped Lot ON 157. The price tag on the can said PLNW and below that $11.99. Can shows no sign of rust and screw on cap was tight. Don't know when the name changed from Hercules to Alliant either. I loaded a few low to moderate 9mm with 125gr Hi Tek coated bullets and they shot fine. Intend to load more for accuracy BUT how old is too old for powder in general? And would New Unique be very similar or the same as the old?