looking for some advice on how to dissipate heat waves from a warm barrel. when i go out trying new loads or target shooting my .338 win mag i find i can initially only get about 4 rounds down the barrel before the barrel heat starts causing heat waves as i look through the scope (this causes my crosshairs to kinda "jump" around). after it heats up, it'll only shoot about 1-2 before i start getting the heat waves again; even if it has sat for 30 mins. this makes it kinda tough to put 3 round groups downrange and i don't have the patience to shoot 1 round, wait 30 mins, shoot another, and so on. it's a savage with a fluted barrel (if that makes any difference). i've thought about bringing a little portable fan to blow the heat to the side so it won't rise and affect the optics. any suggestions? Thanks.