Abstract: Methods and apparatus for making ceramic honeycombs by steps including compounding a plasticized ceramic batch mixture and forming the mixture into ceramic honeycombs by continuous extrusion, drying and firing, wherein one or more ceramic powders for the batch mixture are supplied by in-line homogenization as a powder feed having a median particle size D50 that varies from a maximum value to a minimum value by an amount not exceeding 15% of the maximum value during a 24-hour period of continuous extrusion.