Gents, I hate to be the harbinger of logic here, but the case design is only part of the end result, which is to apply pressure to a projectile, such that it is forced down a rifled tube and propelled toward a distant target. Any cartridge (firing a bullet of a given diameter and weight) that creates greater velocity, does so by applying more pressure, or similar pressure, for a greater length of time. Whether the case is a 110 year-old 30-'06, a WSM or an "Improved" design, they all act as gas seals for the pressure being generated. The amount of powder used, relatively speaking, is of nominal interest, or cost, as well.
All that really matters is how much pressure is created (and your gun is subjected to) for the velocity that is obtained. Attempting to villainize one cartridge design, or laud another, is to ignore the basic principles of internal ballistics. If the gun you choose shoots the bullets you prefer, at the velocity you are seeking, then it is a fine gun, indeed, and needs not be defamed or promoted.