The question keeps coming back to my mind; What can the 5mm do that the 22mag or 17HMR can't? It was originally supposed to bridge the gap between the 22mag and the 22Hornet, but the first has continued to advance, getting closer to 5mm performance and the latter has also left it behind. If I can't kill it with my 17HMR and it kills ground hogs just fine right out to 175yds, then I will step up to a centerfire from there on out.