Barrel length effect on 9mm velocity 3" vs 3.5" vs 4". Just as the title says I am trying to work up some 9mm minor loads and most are loaded through a 4in barrel and I have a 3.5". I know there will be a difference I just don't have a clue how much (couldn't find much chrono data online). 03-27-2011, 10:44 PM #2.. That's closer to the assumed 25 fps per inch of barrel most expect to see. But here, again, that's not a reasonable depiction of the difference. One load only generated 1,340 fps from the 3-inch barrel but blistered out of the 16-inch barrel at 2,155 fps. That's a 60.82 percent (815 fps) velocity gain, or 62.69 fps per inch of barrel.
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9mm Velocity versus Barrel Length. Luger designed his original 9mm to be lethal at 50 meters. Today, modern incarnations of his cartridge significantly exceed that limit. A 9mm round's ballistics depend upon which of the three common bullet weights it's equipped with: 115 Grain 124 Grain 147 Grain; Muzzle Velocity:. 9mm Luger Results in fps. Click here for a Muzzle Energy graph for the tests in this caliber. barrel length. Cor Bon. 90 gr. JHP +P. Cor Bon. 115 gr. JHP +P.