Through extensive evaluation Winchester has determined the above lot of 5.56mm M855 ammunition may contain incorrect propellant. Incorrect propellant in this ammunition may cause firearm damage, rendering the firearm inoperable, and subject the shooter or bystanders to a risk of serious personal injury when fired. DO NOT USE WINCHESTER® SYMBOL NUMBER ZGQ3308 LOT NUMBER WCC10M106-004 5.56mm M855 62 GRAIN PENE AMMUNITION. The ammunition Symbol Number and Lot Number are ink stamped on the outside of the 900-round shipping container, and on the outside of the 30-round carton as indicated here:
As fast as these manufacturers are pumping this out there's going to be some QC concerns.