+1 to what Lemoyne said.

APP, CleanShot, Shockey's Gold (it's all the same stuff) does shoot very cleanly - almost amazingly so. But it IS the weakest thing out their as far as 2fg powders go - taking 15gr more powder to equal a Pyro RS load and 25gr more to equal a 777 load for any given bullet. It is also extremely hygroscopic - it sucks moisture out of the air like a camel filling it's hump full of water. I've had it go bad on me literally overnight, even when kept under humidity-controlled conditions.

I reckon if you had a vacuum-sealing unit, you could vacuum-seal a fresh bottle in 1/4 pound baggies to keep it in useable condition for any time.

Just seems like a lot of hassle when a bottle of 777 can be good for years just as it is.