Sounds like another dose of 6.8x51 Koolaid. Forget afordable and reloadable ammo.

Forget "cooler burning powders'. Basic law of physics - pressure varies directly with temperature. High pressure means high temperature.

The pressure also has implications for cans. Suppresors essentially work by reducing the high pressure barrel gasses down to a lower pressure exit gas. While internal design affects efficiency, the primary mechanism is volume. This means any cans on a high presure system need to larger than on a low pressure system.