Pretty self explanatory - and an eye opener!!
Anyone who trusts an individual at a gunshow hawking private sale of powder or primers is strictly on his own as far as quality.
That's one reason I like the Vihtavuori line of powders - the containers come with a plastic top that must have an attached strip physically removed before opening. - sorta like the old milk container lids. No other powder mfg'r provides something similar, to my knowledge.
Many times, even purchasing at a local sporting goods store, I've wondered if the inner seal on a can of powder wasn't somehow jillflirted because it only seemed partially sealed when I opened it.
Thanks for the heads up, MikeG and Marshall. Tyro handloaders - take heed.