Range testing found that Winchester’s 124-grain NATO rounds averaged (five shots) 1490 fps (feet per second) out of a 5-inch barrel handgun. However, the same ammo averaged 1251 fps (measured with a Chrony chronograph 10 inches from the muzzle of each firearm) out of the Ruger PC Carbine.
Modern 9mm ammo often utilizes fast burning powders to make the most out of pistol length barrels. These particular cartridges do not always translate to higher velocities in longer barrels. Care should be taken to research which 9mm cartridges will hold or even improve their velocities. Large gains (as experienced by the .357 Magnum revolver vs lever action carbine) should not be expected. Moderate gains with lighter weight (115-grain) bullets are more common and can result in slightly better bullet expansion, but slightly less penetration (due to the larger expansion).