I went to the range last week and went through 100 rounds in about two hours. I was very worried about heating up the barrel as I shot. The biggest thing that helped me was taking my time between shots. There were quite a few times I grabbed the barrel and it felt very hot to the touch so I would take a break and let it cool of for a while. I looked into all kinds of stuff from wet towels to using an air pump to push cool air down the barrel and even running water down the barrel. In the end just taking time between shots and giving it a few breaks from firing worked pretty good. My final cure for the over heating barrel is going to be buying a second rifle to shoot while the other is cooling