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A serving is generally 1/4 to 1/3 lb. per person of finished product, and you lose approx. 30° of the weight between raw and cooked. So you need approx. 6.5-7 lbs. of uncooked brisket minimum. If they are large eaters I would get a 10 lb. brisket just to be safe.
remember that good sides will help too, so choose wisely and whatever size brisket you get will be good if you follow the above suggestions. You will likely not have leftovers as most people gobble it all once they have tasted true smoked brisket! Post qview please.
If you are offering a variety of side items i would agree with the quarter pound per person. i also would set up my buffet line with side items or low ckst items first, proteins last the plates fill up with sides and not enough room for meats. Every chef in the world will agree.Thumbs Up