I for one would NEVER POUR WATER down a barrel. Cooling is too rapid and you would risk cracking much faster. I never broke in a barrel for the first 45 years of shooting but now I do.... does it help...who knows... but it sure can't hurt either....and actually it slows you down and makes for an enjoyable first 20 rounds!Recently saw a barrel cooler $55 Amazon also read articles on ice water with a plastic syringe and a small hose followed by dry patches. Also Utah long range shooters tells me there's no such thing as barrel break in simply shoot it and don't look back gun work says the opposite Weatherby says the opposite. Serious push me pull me affect ie: who's right and who's wrong?? I've got all the right equipment no knowledge of the subject. Any advice?? Simply going to be test driving a new barrel for several rounds in the summer heat.