I have used the 142 on antelope. Shot mine at 860, and the bullet did not expand, as one would expect from a 142 smk at that distance. Most consistent bullet I have ever used, but not the greatest in regards to expansion, and clean kills. The antelope did die, but it did go 100+ yards before it did, "both lungs being pierced".Not a big deal in antelope country, but a different story in whitetail country. I would imagine annealing the first 1/8-3/16 of the tips would help in the expansion department.