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shrinkage dilema

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Maths never my strong point, so a bit confused about shrinkage (I really shouldn't be) but when I threw some mugs recently I thought I'd sized them correctly wet but they ended up too big, they did not shrink enough...

So, if my stoneware clay has a shrinkage rate of say 12%, if I made my pot 114mm high x 114mm wide, I'd end up with a pot approx 100mm x 100mm – is that right? 

Also, how much shrinkage should one expect at bisque (say 1050 degrees C) and how much between bisque and fully fired?

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