I'm still trying to sort out this new barrel. I tried something this weekend that seems to work really well, but just wondering if my good idea might not be. Asking to see if anyone knows. It is a 28 Nosler. 3 shots and it is really hot inside and seems not to cool at all in a reasonably amount of time. I went to Academy Sports and bought a high volume fan meant to blow up air mattresses and such. It uses 6 "C" cell batteries. Added a couple of feet of clear vinyl tubing that fits tight in the chamber. It really blows hard and will cool the barrel from the inside in about 2 minutes. Seems to work really well and using ambient air temperature to cool. Question is, is there any danger to the barrel cooling it this quickly? One thing is for sure, it is cheap and seems to work really well.