how barrel length affects velocity - XDTalk Forums - Your HS2000/SA-XD Information Source!

rtparso · 11-05-2006, 08:48 PM

Is there a chart that shows how barrel length affects velocity. Like one bullet shot from a 2”, 3”, 4”, 5”,……12”

**einheit 13** · 11-05-2006, 08:57 PM

Not really a chsrt but the bigger the muzzle flash(wasted energy), the slower the bullet.....a G26 and Makarov are about equal in penetration and energy from 2 very different calibers with a slight egde to the Makarov.

mcb · 11-06-2006, 06:10 AM

From my own testing with my XD-40 Service and XD-40 Tactical I got about 30-50fps reduction in velocity with the 1 inch shorter Service barrel depending on the particular load.

mcb

**Old School** · 11-06-2006, 06:18 AM

Quote:

Originally Posted by mcb

From my own testing with my XD-40 Service and XD-40 Tactical I got about 30-50fps reduction in velocity with the 1 inch shorter Service barrel depending on the particular load.

mcb

+1

If I run my gaming loads (132PF) in my XDSC, they run Sub-Minor. I have not chrono'd them, but I can tell by the feel.

Nerves · 11-06-2006, 06:27 AM

The longer you trap the gases the higher pressure are built, giving the longer duration or powder burn (sometimes) and accelaration time. Each gun/ammo will perfom diff. but I have seen as much 350 fps with 1" gain. (9mm)

Then I've also seen as low as 50 FPS.

ichy_trigger · 11-06-2006, 07:18 AM

I would hazzard to guees that you can figure ON AVERAGE 100 fps per inch of barrel.

griz · 11-06-2006, 07:41 AM

Here's a link to a site that has some data in chart form on different barrel lengths with the .17 HMR round.

http://www.bullberry.com/HMRdata.html

Very clear that a longer barrel produces higher velocities.

Mercmar · 11-06-2006, 10:09 AM

I will hazard a guess that you'll NEVER see 350 fps gain from one inch in a 9mm.

xd4zero · 11-06-2006, 02:46 PM

Just for comparison I chronographed Wally World 40 S&W WWB 165 fg FMJ
966.3 FPS out of 40XDSC 3 inch barrel
1022.5 FPS out of XD40 Service 4 inch barrel
1065.3 FPS out of XD40 Tactical 5 inch barrel
All were 10 shot averages out of the same box of ammo.

rtparso · 11-06-2006, 03:52 PM

Thanks for the input sound like about 50 - 100 fps is the norm. Interesting that in the .17 the velocity starts to drop off at 19". I would still love to see simular data for 9mm .38 .45 and maybe 30-06 or other pistol and rifle rounds.

11-05-2006, 08:48 PM	#1
rtparso XDTalk 500 Member Join Date: Aug 2006 Location: New Mexico Posts: 649	how barrel length affects velocity Is there a chart that shows how barrel length affects velocity. Like one bullet shot from a 2”, 3”, 4”, 5”,……12”

11-05-2006, 08:57 PM	#2
einheit 13 XDTalk 5K Member Join Date: Mar 2005 Location: Virginia, C.S.A. Posts: 5,668	Not really a chsrt but the bigger the muzzle flash(wasted energy), the slower the bullet.....a G26 and Makarov are about equal in penetration and energy from 2 very different calibers with a slight egde to the Makarov. __________________ Once is happenstance, twice is coincidence, the third time is enemy action “It is the lack of will power, and not the lack of arms which render us incapable of offering any serious resistance.”

11-06-2006, 06:10 AM	#3
mcb XDTalk 2K Member Join Date: Feb 2005 Location: North East Ohio Posts: 2,053	From my own testing with my XD-40 Service and XD-40 Tactical I got about 30-50fps reduction in velocity with the 1 inch shorter Service barrel depending on the particular load. mcb __________________ If at first you don't succeed; RELOAD _ _ _ _ My web site

11-06-2006, 06:27 AM	#5
Nerves XDTalk 2K Member Join Date: May 2006 Location: Jacksonville, Fl. Posts: 2,028	The longer you trap the gases the higher pressure are built, giving the longer duration or powder burn (sometimes) and accelaration time. Each gun/ammo will perfom diff. but I have seen as much 350 fps with 1" gain. (9mm) Then I've also seen as low as 50 FPS. __________________ \"WHEN YOU PUT ON YOUR GUN LEAVE YOUR MIDDLE FINGER AT HOME\" NRA Member IDPA Member--Wilson Combat CQB (CDP) USPSA Member--New XD 9 Tac & G34 (Production ) IPSC Open Major--STI Trubor Grandmaster CCW's: -- XD-45 ACP 4" with Truglo TFO's & M6 Laser/Light --Kimber Tactical Pro II, ...Many More

11-06-2006, 07:18 AM	#6
ichy_trigger XDTalk 5K Member Join Date: Jan 2004 Location: Dayton, Ohio Posts: 7,525	I would hazzard to guees that you can figure ON AVERAGE 100 fps per inch of barrel. __________________ "The person who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself." http://militarysignatures.com/signatures/member2645.png

11-06-2006, 07:41 AM	#7
griz XDTalk 500 Member Join Date: Oct 2006 Location: NW MO Posts: 745	Here's a link to a site that has some data in chart form on different barrel lengths with the .17 HMR round. http://www.bullberry.com/HMRdata.html Very clear that a longer barrel produces higher velocities.

11-06-2006, 10:09 AM	#8
Mercmar XDTalk 1K Member Join Date: May 2006 Posts: 1,761	I will hazard a guess that you'll NEVER see 350 fps gain from one inch in a 9mm.

11-06-2006, 02:46 PM	#9
xd4zero XDTalk 100 Member Join Date: Aug 2005 Location: Nevada Posts: 165	Just for comparison I chronographed Wally World 40 S&W WWB 165 fg FMJ 966.3 FPS out of 40XDSC 3 inch barrel 1022.5 FPS out of XD40 Service 4 inch barrel 1065.3 FPS out of XD40 Tactical 5 inch barrel All were 10 shot averages out of the same box of ammo.

11-06-2006, 03:52 PM	#10
rtparso XDTalk 500 Member Join Date: Aug 2006 Location: New Mexico Posts: 649	Thanks for the input sound like about 50 - 100 fps is the norm. Interesting that in the .17 the velocity starts to drop off at 19". I would still love to see simular data for 9mm .38 .45 and maybe 30-06 or other pistol and rifle rounds.

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