I gave up on getting my press running. That has been probably six years ago. I'm finally going to give it another go (so I get to relearn what little I knew about it!). I have several bottles of powder on the bench. They have been sitting in the garage for 6-7 years. I only opened one of them (I think). Am I OK to use the unopened ones, so long as the seal is unbroken? And on the opened bottle, exactly how does one dispose of a bottle of gunpowder??