I use empty coffee containers for storage of as cast bullets or powder coated to age for at least 6 months. They will be finished growing by then. After that time, I will size or lube/size and load.
I've always felt it was best to store my powder, primer, and bullet in the handy and ready to go brass case. Since I got the Mark7 Apex 10, it's not a big deal to crank out a few thousand loaded rounds. It is a big deal to change it over and reset everything up for a different cartridge, so I load a year or two worth of each before changing over.