I do this on all my batches, I don't have a my carboy marked for volume, so the only way I know how much beer I have is to look at the bottling bucket markings. Also, my carboy has so much trub, it would be hard to estimate how much I would actualy get out. Is this bad? I'm so afraid of bottle bombs, I don't won't to piss off SWMBO any more than I all ready do.