But spend your time learning where to shoot an animal and how to shoot well, rather than seek the Holy Grail of penetration. This is because the KE that arrows have is so small that it is ultimately irrelevant to their lethality. I believe weight and broadhead selection are the two biggest factors in penetration. This is because the KE transferred to the animal is significant enough that it causes movement and damage of the internal tissues. The mark could be less, but it takes a trip to the bow shop to play with different arrows and bows, and crunch the numbers. Finally, when the blades deploy, it robs precious energy from an arrow released out of a low-poundage bow. An animal is not made of foam.
Lighter weight arrows with comparatively low momentum can penetrate quite well.
MINIMUM DRAW WEIGHT TO KILL A WHITETAIL
But how do you measure this or make any predictions about penetration from it? Call Us One thing about blade design, though, especially with mechanicals: Assuming factors like broadhead design and sharpness, as well as impact spot and angle are the same, the arrow with more momentum will require more force to stop, and will penetrate farther. For example, I once killed a deer with a mechanical on a low hit that would have resulted in a flesh wound had I been using a regular head. This is because the KE that arrows have is so small that it is ultimately irrelevant to their lethality. You can see that the heaviest, slowest arrow—that also had the least KE—has the greatest momentum, and all other factors being equal, will penetrate the best.