A #10 can says it serves 24, if I recall. But that is greatly underestimated. We usually put 2 cans in a full pan with sauce, meat and other goodies. I figure we can get 70-80 out of that pan easily.
In Iowa, we had two cold sides along with the beans, we figured 10 cans for 400, but only needed 9. I'd say you should be able to get by with 5 cans easily for 200. Especially if you are loading them up as Keri's beans.
Pork Pullin Plowboys
(and Smoke on Wheels
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Todd Johns (me); Blue Springs, MO
Randy Hinck (PigBoy); Concordia, MO
Andy Groneman (Hodedo); KC, KS (Cameo Appearances)
FEC-500SS; FEC-100 (Right handed); FEC-100 (Left handed); Country Smoker Tailgater; Big Green Egg (2-large, small, mini); Cookshack Pellet Fired Charbroiler