I shoot 3 shot groups when I go to the range. At that point I open the bolt stand the rifle up and wait approx 10 - 15 minutes. I'm sure the barrel is not stone cold but it does cool quite abit and provide consistent groups. I'm no expert but this does work for me. Good luck and post the results of your next trip to the range, I'll be looking for it in the future.
Never beat your head against the wall with out a helmet