I will argue that since i have a hardness tester. Clip on WW is in the 12 BHN range. Pure is 5 BHN. Now I do believe that some of the clip on WW from the 1960's and 1970's were almost pure. Now days most WW's are zinc and Steel.
Corey, A bullet that hard will work but they are going to poke holes. There will be full penetration I am sure. Shoulders on a deer should not be much of a problem. If the bullet is in the lungs and heart you will be fine. I don't like ML bullets this hard but I don't use sabots. With a sabot I am sure they would do fine for deer and Antelope. Ron