The designs were based on the principle that maximum straight-line penetration is reached by the use of very heavy bullet shot at slower velocities. The flat metplate of the bullet is designed to cause maximum trauma. The bullet was designed a heavy-duty big stopper. The first bullet in the range was .458,600gr for the Winchester Magnum. Improving the stopping power of this cartridge tremendously. Almost two years of testing and re-designing went into the project before the team was happy with what the bullet could do.
From the 600gr 458 CS Game Ranger, the other bullets followed in 416, 375, 9, 3, 30 Cal, 303 and late in 2004 the three bullets for the 454 Casull/460 S&W were introduced.