Re: New lot of powder is clumping
Best guess is your powder either got wet at some time or top was open in heavy humidity. Spread it and dry it good. It will still shoot but I wouldn't get real picky with the groups it may produce. Could get some erratic extreme velocity spreads. Good luck. Sometimes I use suspicious powder to blow out brass, fireform, work up load developement, etc so I get use out of it. It could be fine and do well.
Predictions are difficult, especially when they involve the future