This is exactly why I will NOT buy powder at gunshows... most of those guys are "weekend dealers" and where does all their inventory sit between gunshows? In a climate controlled garage or warehouse? I seriously doubt it. It sits in their trailer, out in the sun getting baked at over 150 degrees in summer... probably worse down south..
I got a batch of primers that supposed went bad because of exposure to heat that I bought at a show..
Never again. the 2-3 bucks I save isn't worth it.
He who beats his sword into a plowshare, will soon be plowing for somebody else!