I used to take into consideration expansion on impact when choosing pellets for hunting but now I simply choose the most accurate based on the fact that if you scale the pellet to the size of the game as in maybe a Grackle then it would be in comparison like you being hit with a pellet the size of your fist or say as large as a rabbit it would be like you and a pellet the diameter of a Loonie. The associated trama would be significant and shot placement would be more important especially if the target was slightly missed then penetration would be more likely to be fatal, so instead of just breaking a wing or a shoulder the pellet continues on to vitals.