IMR Legendary Powders has announced a product safety warning and recall for IMR 4007 SSC propellant, lot numbers 10130139, 10131139, 10429139, 10430139, 80425139 and 80426139. The lot number can be found on the rear label on the right edge.

IMR has received reports that this particular powder in 1 lb. and 8 lb. containers may have become unstable due to possible rapid deterioration. Use of deteriorated powder may result in spontaneous combustion, detonation, fire damage or possible serious injury.

http://www.imrpowder.com/PDF/4007sscsafetywarning.pdf