Rick, I found a few years back when I was using my 40# bear kodak that I was just not getting the penetration. Plus as you know carp are soft and if you gut shoot them they have a good chance to pull off as Christine said. Just like deer hunting shot placement. Although we all know we just shoot at the fish and take what we get. I use the Penetrator heads. I use just a little bow wax on the threads so they do not seize, but it helps keep them tite. After each fish I check them too.