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They say one picture is worth kilowords. Well, the illustration above pretty well sums up the information in this site. Barrel length vs. velocity!
Ballistics by the inch is the story of how a few guys decided to put some exact figures to the old controversy of "It's not how long it is, it's how you use it" and used almost nine thousand rounds of ammo and a metal saw doing it.
They tested sixteen common pistol calibers, each over a range of barrel lengths (in one inch steps) from 18" down to 2", and each using a variety of ammunition, most of it "premium" ammo made for self-defense purposes. In each case they fired three rounds of a given ammo at a given barrel length, recording the velocity of the bullets at 15 feet with two commercial chronographs. If they did not get two reliable readings for each of three rounds, they repeated the process until they did. Then they would cut an inch off of the barrel and repeat the process.
9,000 rounds of ammunition later, here are their findings.
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