No, the_bird is saying do NOT force carb. use DME or sugar to carb, and the 8g CO2 to dispense. that's what those bulbs are good for is pushing beer out of a keg.
I think I read you get about 25 corny kegs off a 5lb CO2 cylinder. 5lbs = 80 oz of CO2. its 28grams to an ounce...so 3.5 8g bulbs to equal an ounce, or 280 bulbs to equal a 5lb cylinder.
so bulbs aren't real cost effective for force carbing a keg, but work great for dispensing.