The last sow I shot with this Speer TNT 90 gr. 6.5 Grendel ammo loaded by Federal dropped her in her tracks (shot at base of neck/chest) and the bullet did not overpenetrate. This sow was a bit lighter and was shot farther back, this time behind the shoulders, and the bullet did overpenetrate. She also ran a ways before collapsing. I have yet to hit heavy bone or shoot a really large hog with this ammo, but thusfar, I have been pleased with how it has performed.