Oly, Clear shot was made by Goex while A.P.is made by American Pioneer Powder Inc. out of Whitewater, Co., I believe. Having shot A.P., Clear Shot and Clean Shot, I`ve never been able to see any big advantage for one over the other. IMO, all good powders. As far as cleanliness they all are better than Pyrodex(again MO). As far as shelf-life goes, I`ve bought powder in quantity before but always split it with fellow shooters. Also when buying I`ll always try to but the freshest I can as the store I purchase from dates there powder. They always have a big sale on bp after bp deer season. I usually load up then cause we`ll shoot all summer. Trader vic, as Pahoo referred to, the shelf life would be some concern. Considering the current age of the powder, the way it was stored and the length of time it will take you to shoot up 25lb. would be of concern for me.