I started using an IR temperature scanner from Harbor Freight and my target temp is ambient to start shooting again. Has built in laser so you can scan temp at same spot accurately. Just gives me repeatability on when to stop my cool down on consistent basis. Need to? Nope! But just something to do when waiting for barrel to cool. I had it for tracking down a overheating problem in my I/O. Also nice to have if you have a circuit breaker tripping you can see if overheating as well. Tons of uses. So now I have to bring as much cool down gear as shooting gear!