I have been encouraged to make a root beer for a Christmas gathering. I would prefer to keep the guess work out of it, so I am going the easy way. Don't want any bombs or overcarbonation. I'll be using an extract (makes 4 gallons) and force carbonation.
I am a beer brewer who has a few cornies that need action. I would prefer to make the root beer in a corny, force carb it, then counterpressure fill a few bottles for sharing. I have a keg that can be a dedicated soda keg.
I purchased the extract (http://www.leeners.com/soda/store/root-beer-extract-recipe.shtml) and 4 pounds of fine corn sugar from a home brew shop. Now the question is how much sugar per gallon. I can get more, or use another sweetener if suggested. Also, how many volumes of CO2 should I shoot for using force carbonation? I keep my keg fridge at 40, and I am low on beer, so I don't mind keeping the soda on high pressure for a few days, but how high of pressure to force carbonate?