+54mm grain length 76mm with 2mm spacing per grain, so we'll make the casting
+tubes 78mm long. Delrin coring rods of 1/2" diameter.
+
+Formula for a batch size of 1kg:
+
+* 65% KNO3, 650g, taken from the big bucket
+* 35% Sorbitol, 350g
+* 1% RIO, 10.0g
+* PolyStep B1, 15 drops
+
+With left-overs from batch-01, this was enough for all but two of the 29mm
+grains. We added enough materials for another 100g and were able to finish
+up with a bit left over.