I know several people that use them with their Baileys - and they take a regular size class 15 bobbin. Several say they have to strip off a few yards of thread, then they work just fine. I've never tried them - go ahead and try them, you aren't going to hurt the machine, and they'll work or they won't.
When I am working on a quilt, I normally wind 10 bobbins before I start - though I do so with my silver 15-91, as I can get a much tighter, even wound bobbin that way. I do use my fingers to guide and apply more tension as I'm winding.