You can also buy a butt and a picnic (the section of the front leg just below the butt), then mix the meat. A picnic will be cheaper, but the yield is less. Picnics have some darker meat, and some shank meat, which can be a nice touch when mixed with pulled butt.
My personal preference is a ratio of 2-butts and 1-picnic, pulled and mixed together. I rarely do just a picnic. Here is the same photo I posted in the other butt thread tonight. Whole shoulders on top, picnic lower left, butts lower right.
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