I have shot 8-9 elk with the Harvester Hard Cast Lead 400 grain bullet, so I have a pretty good sample.
1 big bull - good 6X6 at 120 yards.
All the rest cows from 10 feet to 100 yards.
The wound channels have been absolutely DEVASTATING.
I think I had to shoot 1 cow a second time, due to shot placement. All of my other shots have been right behind the shoulder and low, taking out both lungs or heart/lung. Needless to say, just about any bullet will kill an elk if you put it in the right place. But the wound channels have seriously been DEVASTATING.
I haven't had to do any real trailing..... Nothing over 50 yards.