Nerd's Cone 6 firing schedule.   Modern firing schedules have been increasingly based on maturing glaze; which in turn means the clay body is not. The biggest indicators that the body is not mature is absorption, vitrification, and pin holes. The COE data given by the makers is based on firing unglazed clay at a much slower rate of climb. In comparison by application: most potters fire bisq at accelerated climbs to their peak hold: which does not allow for heat work to fully penetrate the body