I have a 2 gallon batch scheduled that I'd like to put into a 2.5 gallon keg. Any problems with that?
If the keg is purged with co2, the presence of oxygen should be minimized. I generally fill all of mine with sanitizer and purge. I have had 1/2 gallons of head space due to beer loss : dry hopping or just because I'd rather collect wort that matches my OG, but may be off on volume.
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