Hiding behind tree - can it stop bullets

In our test we take some decent sized pine tree trunks and shoot them with handguns, shotguns and rifles. As expected, 9mm handgun and all shotgun rounds weren't able to penetrate the tree. When we step it up to rifle rounds both and were able to make it through without much hassle. What surprised us all is that .308 has failed to penetrate this tree despite having much more energy compared to or from an AK... We think that because the .308 gets deformed when it enter the tree and that makes, rotate, deviate from the path and loose more energy. What do you guys think, why did the .308 struggle with this test? Also if you have any strange/interesting ideas for us to test, let us know in the comments bellow! SHOP: @SellierBellotAmmunition has sponsored this video with top quality ammo