Abstract: A cartridge which will produce Magnum velocities for projectiles fired by standard auto pistols, revolvers, submachine guns, or single shot firearms. This cartridge case design provides significant structural strength in the casehead web area, unlike standard straight wall cartridges, which allows increased magnum loads without casehead anomalies, ruptures and bulging. Existing auto pistol cartridge case designs have external straight wall configurations from the case mouth to the rear base rim. Existing designs also have rimless type caseheads, and bevel groove cut into the casehead wall for extraction following firing. They also exhibit nominal to thin casehead web thickness. This innovation, on the other hand, utilizes a unique thicker bevel belted casehead web, located above the extractor groove cut. The casehead expands outward on a bevel slant of about 2.