Has anyone noticed whether 777 looses it's efficacy over a year or two?? I had a problem with some 777 over a year ago, it was clumping up. I have a bottle left over from last year, and it seems like the powder has lost some of its OOOMMMPPPHHH!! Is this possible??

I have stored and used smokeless powder, andblack powder in the past with no problems. Some for quite a few years. But this 777 stuff seems different. Tom.