I have had no problems with thin skinned game when using ballistic tips. I have seem problems with bullets that are supposed to be for "controlled" expansion. The deer was shot in the neck, laid motionless for 15 to 20 minutes while waiting to see if anything else would show, then got up and took off. I helped look for the deer, but never found it. I found a small blood spot on the ground, which led me to the bullet. The bullet never expanded. Part of the copper jacket had flaked off, but the bullet never mushroomed.