Assuming you have a CO2 bottle and regulator, you can do with with no problem. Pressurize the 3g keg to about 12psi. Vent to remove oxygen. Pressure to 12psi again. Vent, then pressurize the 5g keg to 12 psi (and leave the gas connected there. Connect the beer to beer jumper and vent the 3g keg in short bursts to start the flow. You may need to vent it a couple times as pressure builds. Basically you want to keep 12psi on the 5g and a controlled 11psi or so on the 3g so that it flows but stays under pressure.
No, there's no way you'll be able to fill bottles with warm beer. BMBF or any bottle filling device needs the beer and bottles to be very cold to minimize Co2 loss.
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Last edited by Bobby_M; 10-08-2009 at 07:22 PM.