Keeping the Grendel cool at the range

[Klem]

• Keep the BCG locked back between strings so air can circulate through the barrel.
  
• Wait longer between shots.
  
• Do your accurate shooting for groups early in the session and then do drills or plinking.
  
• Bring a fan to the range and point it at the barrel. It will also blow the boiling air (mirage) away from above the barrel seen through the scope at high magnifications.
  
• Use a barrel mirage shield like a strip of cardboard or a strip of venetian blind.
  http://bulletin.accurateshooter.com/2018...bon-fiber/
  
• Buy or build a barrel-cooling fan like this one;
  

http://bulletin.accurateshooter.com/2016...t-barrels/

I just wait longer and keep the BCG locked back. Also, if the air is too still I dial down the magnification.