I stumbled on to this website today. If it is a re-post, I don't care so keep it to yourself. I was curious to find out the ballistics of various pistol rounds fired in carbine length barrels. Testing was done using barrels from 2" to 18" and calibers from .25 auto to .45 Colt. Data from real world firearms are also included. A quick look at the 9mm Luger data show no significant increase in velocity much pass 8"-10" of barrel length depending on load. Enjoy.
http://www.ballisticsbytheinch.com/index.html
http://www.ballisticsbytheinch.com/index.html


















































