This probably sounds crazy but...
Three weeks ago I ordered a 243 handi and took a about a week to come in. Well when it arrived, they had ordered the model with the bull barrel instead of the regular barrel. It's heavier than I wanted, but I bought it anyway. I polished the bore and chamber, mounted a Nikon Monarch 3x9, and put locktite on all the screws. Last weekend I took it to the range and put 30 rounds through it. I'd get two rounds almost touching, but I'd always get a flier opening my groups way up. I figure I need to put 50 more rounds through it to finish breaking it in.
I shot those 30 rounds in about an hour, and while the barrel never got hot, it was definitely warm. And even after 15 minutes, the heavy barrel was still warm.
So here's the crazy question, can I clean the barrel with gun scrubber or some other aerosol cleaner to cool the barrel without damage?
I don't want to get it red hot and dump it in a bucket of water like a buffalo hunter, but I want to cool it when it gets warm to shorten my wait time.