Law of diminishing returns.
A custom 7mm08 (1-8" barrel, 3" magazine) shooting 180 ELDM's at 2600fps is going to be enough gun for 99% of hunting situations near and far.
A Rem Mag/ 7 PRC will get you to 2800-2900 fps easily with a 26" barrel with the same bullet...
To say a 18-20" barrel could have even greater muzzle velocity? You are going to have to be able to handle a rifle very well to see any benefit, especially if it is light!
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