Pistol with short barrel and deep groove rifling

A barrel for a firearm that fires a projectile from a cartridge shell, comprising:

• a barrel body extending for a barrel length between a proximal end and a distal end, wherein the barrel body has a body longitudinal axis;
• an interior bore extending through the barrel body from the proximal end to the distal end, wherein the interior bore is comprised of a rifled section and a cartridge chamber section and has a bore longitudinal axis aligned with the body longitudinal axis, wherein the cartridge chamber section has a chamber length extending from the proximal end to a chamber end location between the proximal end and the distal end, wherein the cartridge chamber section has a first chamber diameter, wherein the projectile extends from the chamber end location to a projectile end location in the rifled section of the interior bore, wherein a projectile travel length of the interior bore extends from the projectile end location to a muzzle at the distal end, wherein the rifled section of the interior bore has a plurality of rifling grooves with a land diameter and a groove diameter, wherein the projectile travel length is less than the chamber length, wherein the rifling grooves extend helically through the bore between a plurality of rifling lands, wherein each of the rifling lands has a land width, and wherein the groove diameter is greater than the land diameter by an amount that is more than one half of the land width.