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What bmudd said, although you might be hard pressed to get 8 oz. of shredded meat on some buns, plus onion, plus pickles, plus.... But as inexpensive as buns are, it's really insignificant if you have more than less. My $0.02.
I serve 1/3 pound cooked meat in sandwees when I'm doing the serving. Meat in one half of the bun scoop of slaw on the other let people sauce if they want. Scoop of beans and a scoop of tater salad, send them in their way to the table.