Whether you're buying pre-ground coffee or grinding it yourself from whole beans, the texture of the grind should be correlated to the method of brewing. The coarsest grinds are used for open-pot brewing and percolators. A slightly finer, but still coarse grind is used for the French press, since the particles have to be large enough to be corralled by the filter. Automatic drip brewers can use a finer grind, since the paper filters capture any sediment. The finest grinds are used for espresso and Turkish coffee.
Generally speaking, you should use the finest-ground coffee that will work for your …
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