1 gallon in a 5 gallon corny

[spm0009]

I decided to brew a couple of one gallon exp. batches for the winter time and I only have a 5 gallon corny keg. I carb with a 20 oz. paintball tank that I converted. Since I want to carb this one gallon in the keg, do y'all think I will have enough CO2 to be successful or will there be too much head space?

 

[zachattack]

The only problem is that you'll blast through all your CO2 purging out all the headspace. With 4 gallons of headspace you'll probably want to purge many times to make sure you get all the O2 out, and if your lid seal is a bit finicky and you need to crank it up to 30 psi or so you'll waste even more. I don't know if 20 ounces will be enough. If it were me, I'd just bottle the one gallon.