May not help you much but .... I have used Hornady's "Flex Tip" bullets in my 444 Marlin. I have taken only a hand full of shots at game with it ... white tail deer and feral hogs. The majority have been at distances between 30 and 75 yards, with one "long" shot at a ranged 164 yards. I have had no issues with penetration or jacket saparation. All shots have been pass throughs except the 164 yarder. That bullet was found under the skin of the opposite sie ... perfectly mushroomed.