Home Forums Classifieds Blogs Today's Posts Search Social Groups



  
SIGN-UP
Notices

Glock Talk
Welcome To The Glock Talk Forums.

 
  
Reply
 
Thread Tools Display Modes
Old 08-16-2013, 11:44   #1
bigred94
Registered User
 
Join Date: Sep 2009
Location: eclectic al
Posts: 9
barrel length vs velocity

does anyone have any real numbers on the 10mm with the factory 3.78" barrel (G29) vs the 4.60" barrel G20). I have a 29 and was thinking about selling to the get a 20 to get the full power of the 10mm if there is a big difference between the barrel lengths.
bigred94 is offline   Reply With Quote
Old 08-16-2013, 11:57   #2
vaquero aleman
"ah-lay-mahn"
 
vaquero aleman's Avatar
 
Join Date: Jan 2009
Location: On the other side of the tracks
Posts: 756
The guy that calls himself "Ammo Test" on youtube has a video for the G29 and the G20 so that should give a relatively close evaluation on the different velocity numbers.

http://www.youtube.com/watch?feature...&v=pU83fh6XoYA

http://www.youtube.com/watch?feature...&v=8C7OEG_OlhU

http://www.youtube.com/watch?feature...&v=lqkE_Ma66kU

If I am reading his results correctly he is showing an avg with Underwood 200 grain:

G29 avg 1230fps

G20 avg 1265fps

However, this LWD barrel cost me about $135 delivered.

The 10 Ring

At 4.6" this barrel gives me the choice of having a G29 or a G20, as far as velocity is concerned.
__________________
G2930SF, The 21 Club #7663, The 10 Ring #7663, The Bull Dawgs Club #???, US Army Veteran


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

___________________________________________
Amateur Glock Modification Expert...

Last edited by vaquero aleman; 08-16-2013 at 17:40..
vaquero aleman is offline   Reply With Quote
Old 08-16-2013, 12:07   #3
eb07
Sharkin'
 
eb07's Avatar
 
Join Date: Feb 2010
Location: Third Rock From the Sun
Posts: 2,471
Quote:
Originally Posted by bigred94 View Post
does anyone have any real numbers on the 10mm with the factory 3.78" barrel (G29) vs the 4.60" barrel G20). I have a 29 and was thinking about selling to the get a 20 to get the full power of the 10mm if there is a big difference between the barrel lengths.
The G29 is THE most versatile semi-handgun. Do not get rid of it. A little under an inch does not affect it that much.

Here are MY chrono averages out of a stock barrel:

Buffalo Bore 180gr JHP 1270fps 645ft lbs
Underwood 135gr JHP 1500fps 675 ft lbs
Buffalo Bore 220gr hcl 1050 fps 533 ft lbs
DoubleTap 200gr FMJ 1150fps 587 ft lbs
PMC 180gr JHP 950fps 360 ft. lbs
Underwood 165gr JHP 1310 ps 629 ft lbs
DoubleTap 135gr JHP 1390fps 570ft lbs
DoubleTap 165gr JHP 1300fps 619 ft lbs
DoubleTap 155gr JHP 1300fps 582 ft lbs
Underwood 180gr JHP 1230fps 605 ft lbs


Other than the low powered PMC load every hot load I have shot and tested has been a winner.

I do not have G20 data to compare to

Last edited by eb07; 08-16-2013 at 12:11..
eb07 is offline   Reply With Quote
Old 08-16-2013, 16:28   #4
bigred94
Registered User
 
Join Date: Sep 2009
Location: eclectic al
Posts: 9
thanks for the great info! there is not enough difference indeed to sell the the 29 and get a 20. what is yalls favorite grain bullet for the 10mm?
bigred94 is offline   Reply With Quote
Old 08-16-2013, 17:45   #5
vaquero aleman
"ah-lay-mahn"
 
vaquero aleman's Avatar
 
Join Date: Jan 2009
Location: On the other side of the tracks
Posts: 756
I keep it simple. The original 10MM was the 200 grain so that is my preferred.
__________________
G2930SF, The 21 Club #7663, The 10 Ring #7663, The Bull Dawgs Club #???, US Army Veteran


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

___________________________________________
Amateur Glock Modification Expert...
vaquero aleman is offline   Reply With Quote
Old 08-16-2013, 20:28   #6
1canvas
Senior Member
 
Join Date: Feb 2008
Location: ne ohio
Posts: 2,421
for me the difference between the two maybe a little velocity difference but a big difference in handling recoil of hot rounds. the G20 is easy shooting with the hottest 10mm ammo, the G29 not so pleasant.
__________________
Member - Armed Citizens Legal Defense Network
1canvas is offline   Reply With Quote
Old 08-16-2013, 20:30   #7
1canvas
Senior Member
 
Join Date: Feb 2008
Location: ne ohio
Posts: 2,421
I know in loading the .44mag that the barrel length has less effect on heavier bullets. the lighter bullets show a bigger difference in velocity between short and long barrels.
__________________
Member - Armed Citizens Legal Defense Network
1canvas is offline   Reply With Quote
Old 08-17-2013, 15:21   #8
gator378
Gator378
 
Join Date: Jan 2001
Location: St. Peters, Mo, USA
Posts: 580
Quote:
Originally Posted by 1canvas View Post
I know in loading the .44mag that the barrel length has less effect on heavier bullets. the lighter bullets show a bigger difference in velocity between short and long barrels.
8 inch 629 240 g XTP 24.0 gr H110 1390 fps

Model 1894 20 inch 1800 fps.

The slower burning powders show greater velocity with longer barrels.
__________________
gator378
gator378 is offline   Reply With Quote
Old 08-17-2013, 21:34   #9
1canvas
Senior Member
 
Join Date: Feb 2008
Location: ne ohio
Posts: 2,421
Quote:
Originally Posted by gator378 View Post
8 inch 629 240 g XTP 24.0 gr H110 1390 fps

Model 1894 20 inch 1800 fps.

The slower burning powders show greater velocity with longer barrels.
I was refering to a couple inches + or -.













-
__________________
Member - Armed Citizens Legal Defense Network
1canvas is offline   Reply With Quote
Old 08-17-2013, 22:17   #10
TDC20
Senior Member
 
TDC20's Avatar
 
Join Date: Apr 2011
Posts: 610
Quote:
Originally Posted by 1canvas View Post
for me the difference between the two maybe a little velocity difference but a big difference in handling recoil of hot rounds. the G20 is easy shooting with the hottest 10mm ammo, the G29 not so pleasant.
I agree with this.

Here are some data points for you. This is my hot 180gr. XTP and 800-X handload:

G29 stock bbl 1218.4 fps

G20 stock bbl 1295.6 fps

G20 LWD 6" bbl 1400.8 fps

And, a very warm A#9 with a 180 XTP handload:

G29 stock bbl 1182.3 fps

G20 stock bbl 1244 fps

Hope that helps.
__________________
A handgun is only good for fighting your way to a rifle.
TDC20 is offline   Reply With Quote
Old 08-19-2013, 09:47   #11
agtman
10mm Spartiate
 
agtman's Avatar
 
Join Date: Feb 2001
Location: Midwest
Posts: 3,592
Quote:
Originally Posted by bigred94 View Post
does anyone have any real numbers on the 10mm with the factory 3.78" barrel (G29) vs the 4.60" barrel G20). I have a 29 and was thinking about selling to the get a 20 to get the full power of the 10mm if there is a big difference between the barrel lengths.
Several of the ammo-makers catering to 10mm-fans have posted their own chronograph numbers for their ammo as fired in real-world guns having different barrel lengths. These include the 5" Delta, 4.6" G20 and 3.8" G29.

DT started doing this a while back, and on one of the 10Ring stickies I thought Mike had posted the fps/fpe stats for DT's 10mm loads (those avaible at that time), chronographed from the G20 & G29. BB does this also for their 10mm ammo, and the fps/fpe stats out of the guns that BB uses can be found on Midway's site.

From the DT site:

"Caliber : 10mm
Bullet : 230gr Wide Flat Nose Gas Check Hardcast
Ballistics : 1120fps/ 641 ft./lbs. - Glock 20
1008fps / 519 ft lbs 100yds Glock 20
Glock 29 - 1075fps
Box of 50rds
."

http://www.doubletapammo.com/php/cat...roducts_id=158


For what it's worth from my experience, the heavier 10mm bullets, when fired at real 10mm velocites (i.e., the full-throttle stuff) seem to lose relatively less velocity from the shorter barrels than do the lighter-weight bullets. Ballistic experts can probably tell you why that is, but over time I've seen this phenonmena re-appear in the chrono data.

My preference in bullet-weight for the 10mm AUTO is old school, which is to say "heavy." I've been with this round since the late 1980s and so I prefer the 180gn+ bullets, and when you can find them the 200gn slugs. The original concept of 200gns @ 1200fps defined "heavy & fast," as between the 9mm (light & fast) and the .45acp (heavy & slow), which were the only other practical choices you had in an autoloader back in the day.

Two years ago I bought 1500 of Hornady's 200gn FMJ-FP bullets, so I got well-stocked there. I also really liked Speer's 190gn truncated FP bullet for reloading and training purposes (loaded to 1200+fps), but it was discontinued in favor of a 180gn FMJ. I picked up some of those, and I also liked the box of 500 Berry's 180gn bullets I got at Cabela's. But that all got loaded up and shot a while back.

I've also stocked up on - because the were available a few years back at a reasonable price - 1000 Remington 165gn FMJ bullets. Those I still have. But I'd buy another 1500 of Hornady's 200-grainers in a mil-a-sec if I could find them.

__________________
The 10mm AUTO: when you're finally serious about stopping power.
More great 10mm sites:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

Last edited by agtman; 08-19-2013 at 09:55..
agtman is offline   Reply With Quote
Old 08-19-2013, 11:58   #12
G29SFWTF
Senior Member
 
Join Date: Aug 2012
Posts: 206


As a G29 owner I'm always wondering how much less velocity I'm getting. My typical guess is -80fps. The notion of losing less with a heavy bullet is interesting though.

Someday I'd like to get a chrono and test the Underwood line for averages from my KKM and the stock bbl.
G29SFWTF is offline   Reply With Quote
Old 08-19-2013, 13:00   #13
captaintrips
Member
 
Join Date: Aug 2012
Posts: 95
Quote:
Originally Posted by G29SFWTF View Post


As a G29 owner I'm always wondering how much less velocity I'm getting. My typical guess is -80fps. The notion of losing less with a heavy bullet is interesting though.

Someday I'd like to get a chrono and test the Underwood line for averages from my KKM and the stock bbl.
Based on reading a bunch of numbers that others have put on the internet I figure that a bullet from a 29 will travel around 95% of the speed as one from a 20.

It is not exact by any means, but gives me an idea when I see numbers for the 20.

From doubletap:

Bullet : 150gr. Nosler Jacketed Hollow Point.
Ballistics : 1475fps / 725 ft.lbs. - Glock 20
1400fps Glock 29

1400/1475= 94.9%

Bullet : 200gr Nosler JHP
Ballistics : 1250fps / 694ft lbs. muzzle - 5"bbl
1083fps / 521 ft lbs 100yds 5"bbl
Glock 29 - 1195fps Muzzle

1195/1250= 95.6%

Bullet : 230gr Wide Flat Nose Gas Check Hardcast
Ballistics : 1120fps/ 641 ft./lbs. - Glock 20
1008fps / 519 ft lbs 100yds Glock 20
Glock 29 - 1075fps

1075/1120= 95.9%

Based on these numbers and others, I will agree that the drop off is less with the heavier bullets.
captaintrips is offline   Reply With Quote
Old 08-19-2013, 14:08   #14
1canvas
Senior Member
 
Join Date: Feb 2008
Location: ne ohio
Posts: 2,421
many here that have clocked DT ammo say their posted velocities are bogus.
as far as performance between the 20 and 29 I believe is minimal but the 20 handles much better. the only reason I would get a 29 over a 20 is maybe for regular ccw.
__________________
Member - Armed Citizens Legal Defense Network
1canvas is offline   Reply With Quote
Old 09-04-2013, 12:05   #15
edporch
Senior Member
 
edporch's Avatar
 
Join Date: Aug 2006
Location: Indianapolis, Indiana, USA
Posts: 366
Quote:
Originally Posted by bigred94 View Post
does anyone have any real numbers on the 10mm with the factory 3.78" barrel (G29) vs the 4.60" barrel G20). I have a 29 and was thinking about selling to the get a 20 to get the full power of the 10mm if there is a big difference between the barrel lengths.
I saw a video on YouTube a while back where a guy compared the muzzle velocity of a stock Glock 29 barrel with a Storm Lake barrel of stock length.

If memory serves, he was getting 50-70fps more with the Storm Lake barrel.

I bought one for my Glock 29 and it was been flawless.
All I did was polish the outside of it.
__________________
G20/21/23/27/29/30
NRA Life Member
GOA Life Member
SAF Life Member
edporch is offline   Reply With Quote

 
  
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump




All times are GMT -6. The time now is 05:56.




Homepage
FAQ
Forums
Calendar
Advertise
Gallery
GT Wiki
GT Blogs
Social Groups
Classifieds


Users Currently Online: 955
230 Members
725 Guests

Most users ever online: 2,672
Aug 11, 2014 at 2:31