Effect of output inductor DCR on switching power supply
Inductor DC resistance affects overall efficiency. If you choose a high DCR then the inductor will heat up more, possibly to the point of losing its own inductance. The inductor datasheet will have a thermal derating for this.

330 mOhm (0.330 Ohm) is marginal for a 500mA regulator, having .083W loss. You could make better choices to further improve efficiency; WebBench lets you experiment with that.