I have a TC black diamond and use it only for elk hunting. I have been blessed to take two elk with the gun. I use 348gr Powerbelts and 90 grains of Clear Shot. This load groups best in my rifle and shoots thru broadside elk. A friend of mine was working up a load for his TC and having problems. He called TC and spoke with one of their technical experts. They advised him to shoot heavier bullets for better groups. Might or might not work for you, and you will get lots of opinions/ideas here. Good luck.