I know lots of folks do it and do just fine, but way back when I was learning to reload, the old guy showing me the trade drummed into my thick head just how dangerous it 'could' be by storing powders in containers other than the original. Now in the something over 50 years I've been reloading, I won't say I have never done it, but I will say it was very, very few times for reasons other than not fitting my shelf. I remember a time when I dropped a can of Unique (can't swear it was Unique, but I think so) and cracked the corner of the can. Opened a little at the seam between the bottom and the side. So, I put whatever was left in that can into a screw lid plastic jar of some kind.
Then I painted on three sides of the jar the name of what was inside it. If you're gonna' do it, be careful.