At USBevX a few days ago I heard lots of questions about various wines aged in Bourbon barrels. But I did not hear lots of answers so I thought I would take a look and see what’s going on. This Fetzer example, above, seems like a good place to start.
It tends to show that it is okay to mention Bourbon on a vintage- and varietal-designated wine. I am a little surprised I don’t see any reference to a formula approval, or to the amount of aging in said barrel. This Fetzer label is also noteworthy because it quickly drew the ire of the big Buffalo, as in Buffalo Trace; Sazerac charged at Fetzer for attempting to graze on land staked out long ago by the whiskey company. This really good article discusses the trademark dispute, about 1/3 of the way down the page.
I see about 64 wine labels with reference to Bourbon as approved by TTB during the past five years. Another representative one, from another big company, is this Robert Mondavi approval. I don’t really see any comparable labels, in the prior five year period. From these two examples, and a bit of asking around, it sounds like the reference to Bourbon should not appear on the same line as the wine’s class/type statement. Also, you are more likely to need aging details (e.g., Aged 6 Months) on the label if the age reference appears on the “brand label.”