My partner has taken a spike and raghorn elk with the IB. Both cases produced pass thrus with good wound channels, though shots were 250 or less. I have used the TSX on 4 elk and 2 moose thus far, I love the bullets performance on bigger game. I have yet to fire a shot intoeither at much longer then 200 yards with them.

I will say after working with my partners rifle I deceided towork withthe IB's formyself this year on the range and was very impressed, though it took a little effort I developed one of the best loads for my rifle using the IB. In my case the accuracy past 300 yards is superior with the IB to that of the TSX. The only thing I took with the 154gr IB load was a mulie doe at over 400, it produced a pass thru and DRT result.