Expansion isn't the whole story on bullet performance. Given enough velocity a flat point solid will blow wound channels considerably larger than caliber size. Take enough velocity away and a expanded bullet will make holes smaller than the expanded diameter. Although that's better than not expanding at all, its still a long ways from the same expanded/half blown up bullet making a wound channel the size of my leg. A bullet can still make large wounds at low speeds by fragmenting, and that is the real bottom line on using frangible target bullets for long range hunting. From what I remember of using 30-30s they loved to blow the front end of the bullet off. Back then I thought that was a bad thing, but with time I learned that that was the best deal around for a low velocity deer gun.