The Firing Line Forums - View Single Post - how much more speed a 9mm would have from 4" to 5" barrel?

jmr40 · March 5, 2013, 06:29 PM

This is not perfect, every gun is different, but is as good a guess as any. According to this website around 50 fps. I've not chronographed 9mm from anything but my 4" G-19 so I don't have any direct comparison with 9mm.

http://www.ballisticsbytheinch.com/9luger.html

I have shot multiple barrel lengths in 44 mag and 357 mag handguns and several rifle calibers and have found their results with those calibers to be pretty accurate. Not perfect, but close

You also have to consder that each gun/barrel is different. It is not uncommon to see 50 or more fps difference between identical guns with identical barrel lengths firing ammo from the same box.

March 5, 2013, 06:29 PM	#2
jmr40 Senior Member Join Date: June 15, 2008 Location: Georgia Posts: 10,809	This is not perfect, every gun is different, but is as good a guess as any. According to this website around 50 fps. I've not chronographed 9mm from anything but my 4" G-19 so I don't have any direct comparison with 9mm. http://www.ballisticsbytheinch.com/9luger.html I have shot multiple barrel lengths in 44 mag and 357 mag handguns and several rifle calibers and have found their results with those calibers to be pretty accurate. Not perfect, but close You also have to consder that each gun/barrel is different. It is not uncommon to see 50 or more fps difference between identical guns with identical barrel lengths firing ammo from the same box.