Before you get all hot and heavy over the
peperoni cartridges, look at the pressures they use to get those velocities. If you notice, they do not publish these and independent labs have found them to be in the 70,000 pluss range. This is not conducive to long barrel life, rifle life, or when chambered in the wrong gun your life.
Now look in your loading book at the .300 Win Mag, check the pressures, not if we increase them 20,000 PSI we too can get super velocities.