I used these one year in my T/C Omega over 120 grains of FF 777 and they were very accurate. I hit a big whitetail in the shoulder and the bullet hit and smashed the upper leg bone. Unfortunately, the bullet totally disintegrated in the shoulder and did not penetrate into the body cavity. I finally got the buck after a long chase, but lost confidence in these bullets. They only made these for a couple years and then came out with the "improved" SST bullets - I believe. I now use Hornady 240 gr. XTP-HP/MAG bullets in all my Omega loads and in all my .454 Casull loads and have never had one fail.