My theory is this.
In F Class where shots are slower paced and wind bucking is more important due to wind changes being greater during the longer wait between shots while you wait for targets to be pulled.
As you have to wait for your target to be pulled, you get time to eject, load and set the rifle up to aim again. Getting 5 shots away in 20 seconds is not needed.
In 1000yd (or 600yd) BR light gun, shooting blind, the shooters find more benefit in getting all of their shots with a SLIGHTLY more accurate cartridge, down range in one condition in 20 seconds flat than they would with a bigger cartridge with slightly better wind bucking. It is not just a question of less recoil with the Dasher type cartridges, but also easier extraction and slightly lass bolt throw causing less rifle upset with the light 17lb guns when you are trying to get the shots down in a hurry.
In heavy gun, 300 WSMs are more popular than in F class as the recoil is not an issue with a 60lb gun, while the big guns can make the most of a 300WSMs accuracy. As they have to fire 10 shots, they can benefit from better wind bucking as they are getting shots down for longer. With the big actions and long bolt handles, they can muscle the big cases in and out with more of a reef from the shooter, without the guns moving around in their bags due to the 60lb weight.