For several years I have used hornady BTSP 139 gr in my 7 mag. Never had a whitetail take a step after being shot. I decided to try the SST this year. I shot a doe in the chest last week with the new SST. The deer was at about 70 yds. The doe ran about a hundred yards. When I was cleaning it fragments of the SST were everywhere. Next weekend I am going to carry the Hornady BTSP with me. Some people say they love the SST while others hate them. I hate them. At a lower velocity they might be fine. But with a 7 mag be careful. Just my experience.