I am no expert, but isn’t buying into any bond fund now expensive and more likely than not, regardless of what it is, to drop in value as rates go up. If you are buying any bonds, I would have thought that buying short maturity individual bonds at par, (or new issues) and laddering them to take advantage of rates as they rise is the only safe way. You just need to accept the very low yield. BBN only has an average return and risk rating and three stars from Morningstar.