We have had really great results with the following Bottle Slump Program:
Make sure you place it on the Firing Paper before firing.
Bottle Firing Schedule
Segment 1: 400F/hour to 1000 F, hold for 10 min
Segment 2: 9999(as fast as possible) to 1400F, hold for 1 hour 30 min
Segment 3: 9999 (as fast as possible) to 1000F, hold for 10 min
Segment 4: 800F to 950F, hold for 45 min
Segment 5: 500F to 700F, hold for 0
Segment 6: 200F to 120F, cool to room temperature
Other products mentioned in this video:
Firing Paper - https://www.ceramicarts.com/t-firepaper-1-t-firepaper-1-firing-paper-50/sht10
High Temp Wire - https://www.ceramicarts.com/hi-temp-wire-10-17-gauge/tl495
Boron Nitrate Spray - https://www.ceramicarts.com/product/00/sht21/SPRAY-N-FUSE-MOLD-RELEASE-12oz
Slump Molds - https://www.ceramicarts.com/glmold110/bottle-slumps
