Moonburner, or offset, has a circular core that is off-center. This offset is against the casting tube wall for a full offset. It will initially have a progressive, then a regressive burn. The moonburner can be made into Bates grains or single grain.
Coreburner, having a central circular core with restricted ends, have a progressive burn. When a coreburner grain has unrestricted ends, then they are refered as Bates-type grains. These grains give an almost neutral burn.
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