They are amazing!!! Just compare gel test to bergers and Eld-x on youtube. The penetrations is still great but after 2 inches into the flesh it opens up and keeps going. Vs the berger it opens up after 4-6 inches in. The problem is these are no where to be found anywhere. Sierra has not kept up with the 7mm. You find the 6.5, 30cal, and 22 77g but thats about it. Not only that compare those bullets on gel test as well in those calibers. They always react the same and do very well on low velocity as well. My 2 cents they are the best game bullet there is. However I have not tried them on Elk yet. Four antelopes, and 3 coues. Not only do they enter and don't exit, everyone destroys the lungs completely and destroys the spine. Vs the Eld-x which are great bullets but they always pass through with a golf ball size and run 20 yds. TMKs have no steps after being shot, dead before they hit the ground.