A 1/2 oz or less for sampling. You might try a half dozen barrels before finding a exceptional one. (if you go to the distillery) The distilleries can send 3 samples to the sponsor store. That's what we did for the last 3 picks. You only get 3 choices though. If you don't like them the distillery has to send out more. Here's 3 bourbons and 3 ryes from Driftless Glen.
You can taste, spit, rinse, and repeat. That's how the distillery blenders do it.
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