We use special powders blended for us by the manufacturers. We constantly test during production to make sure that the load is up to advertised velocities. When we open up a new lot of powder or primers, we redo the load and re-test. Every production lot is continuously monitored and checked every half hour during its production. Guns in use here at the plant.
Many people call and note their guns give even higher velocities.
We never exaggerate stated performance. We don't have to at Cor-Bon. Only 45ACP pistols can be converted to 400 CorBon via a new barrel chambered in 400 CorBon. Most any .45ACP can be easily converted to the the 400 CorBon with a simple barrel change. You can use the same magazine, rails and springs.