I never bisque them, but have had a few blow over the years, not so much anymore. When I make mine, I usually make about 3-4 at once with a long coil. I place the cones in the coil leaning perpendicular to the length of the coil, that way I can see each one as it drops through my little peephole(L&L with no controller). After setting the cones, I use a pencil or a sharpened round rib to perforate the clay multiple times. Then I cut the lengths with a metal rib, and perforate the ends also. I let them dry til firing time and then do a light (1 hr) water smoking to drive out atmospheric moisture. I also do this in the glaze load to dry the pots if freshly glazed, relieves shivering and other defects. I do use the 5,6,7 line up, and it has been very consistent for me over the years. I have also gotten pretty good at color temp recognition for my kiln and use that to help me judge how long before cones will begin to drop, experience will often make up for lack of intelligence.
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