spaniel
Here is my take on the "penciling..." The bullet is driven so fast by the heavy charge + the areodymanics of the bullets + the toughness of the bullet - it really doesn't get time to expand before it is out of the animal - deer in particular - elk that would and could be a different situation all together.
This is all speculation on my part from reading posts explaining results and powder charges... They all seem to indicate at longer ranges the bullet work great..- I have not shot this bullet at all....