someone decided to put belts on cartridges.
I do admire men who can shoot big bore rifles, especially off benches. I'll be right up front with my limiting my recoil threshold to the 7MM Rem Mag. That gun about knocked me back to the Middle Ages. I doubt whether Muhammad Ali hit harder. The .300 Win Mag is popular because it works as advertised. Whether it will kill any better than an '06 is doubtful.
That's because you have a mangina...