Velocity loss in longer barrels - RimfireCentral.com Forums

Go Back   RimfireCentral.com Forums > >

Join Team RFC to remove these ads.
Reply
 
Thread Tools Display Modes
  #1  
Old 10-09-2021, 02:41 PM
StephenBachiler is online now

Join Date: 
Sep 2020
Posts: 
547
TPC Rating: 
0% (0)
Velocity loss in longer barrels



Log in to see fewer ads
I do not own a chronograph or I would not be asking, but has anyone documented the fps loss for SV and HV .22lr out of a 28 inch barrel? I would love that info. I have seen references to a 20-50 fps reduction. Any hard data?
Reply With Quote
  #2  
Old 10-09-2021, 02:54 PM
bugeye's Avatar
bugeye is online now
NRA Member - Click Here To Join!

Join Date: 
Aug 2003
Location: 
Morrow Ga.
Posts: 
1,089
TPC Rating: 
0% (0)
I may be wrong, but I’ve heard that bullets other than hyper velocity run out of steam at around 16” and after that are just coasting. (slowing down)
I don’t have any data to help you.
Reply With Quote
  #3  
Old 10-09-2021, 03:07 PM
Rocinante's Avatar
Rocinante is online now
US Navy Veteran NRA Member - Click Here To Join!

Join Date: 
Apr 2007
Location: 
MN
Posts: 
799
TPC Rating: 
0% (0)
It all depends on the powder used.

In the past long barrels would cause some velocity loss and 16-18 inch barrels were about the max for best performance.

Now there are .22 LR powders that can take advantage of longer barrels.
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old 10-09-2021, 03:10 PM
aztarget's Avatar
aztarget is online now

Join Date: 
Mar 2008
Location: 
Tucson AZ
Posts: 
3,436
TPC Rating: 
0% (0)
This should help you
http://www.ballisticsbytheinch.com/22.html
Reply With Quote
  #5  
Old 10-09-2021, 03:14 PM
StephenBachiler is online now

Join Date: 
Sep 2020
Posts: 
547
TPC Rating: 
0% (0)
Quote:
Originally Posted by aztarget View Post
I tried that...did not see 28 in...longest was 23.

Thanks for posting anyway...appreciate the response
Reply With Quote
  #6  
Old 10-09-2021, 03:32 PM
aztarget's Avatar
aztarget is online now

Join Date: 
Mar 2008
Location: 
Tucson AZ
Posts: 
3,436
TPC Rating: 
0% (0)
did a little more digging and found this.

The following information is from Mark White's book "The Ultimate Ruger 10/22 Manual and User's Guide" . Apparently, he cut a 28 inch barrel two inches at a time and measured for muzzle velocity.

Ruger 77/22; Remington Standard Velocity .22 LR ammunition
Barrel Length/ Velocity
28 1095
26 1107
24 1119
22 1129
20 1138
18 1149
16 1157
14 1149

So, based on this, it would seem maximum velocity in a .22 is acheived at 16" with a loss of about 5 fps/inch over the next 12 inches.
Reply With Quote
  #7  
Old 10-09-2021, 04:29 PM
Al the Infidel's Avatar
Al the Infidel
US Marines Disabled American Veteran NRA Member - Click Here To Join!

Join Date: 
Jan 2007
Location: 
yankeeville, Yooperland
Posts: 
1,019,065
TPC Rating: 
0% (0)
Quote:
Originally Posted by aztarget View Post
did a little more digging and found this.

The following information is from Mark White's book "The Ultimate Ruger 10/22 Manual and User's Guide" . Apparently, he cut a 28 inch barrel two inches at a time and measured for muzzle velocity.

Ruger 77/22; Remington Standard Velocity .22 LR ammunition
Barrel Length/ Velocity
28 1095
26 1107
24 1119
22 1129
20 1138
18 1149
16 1157
14 1149

So, based on this, it would seem maximum velocity in a .22 is acheived at 16" with a loss of about 5 fps/inch over the next 12 inches.
What if its choked like my CZ UL? Al wondered to himself.
__________________
You carry a gun so you are hard to kill... know the law so you are hard to convict.
Reply With Quote
  #8  
Old 10-09-2021, 05:16 PM
David Valdina
US Marines Veteran NRA Member - Click Here To Join!

Join Date: 
Aug 2004
Location: 
Barefoot Bay, Florida and Cape Cod, Massachusetts
Posts: 
3,723
TPC Rating: 
100% (4)
Hi Al, take a hack saw to it ?

Hi Al, Take a hack saw to it and report.
Reply With Quote
  #9  
Old 10-09-2021, 05:46 PM
TrblShtr
US Air Force Veteran NRA Member - Click Here To Join!

Join Date: 
Aug 2011
Location: 
Nebraska
Posts: 
2,263
TPC Rating: 
0% (0)
Quote:
Originally Posted by David Valdina View Post
Hi Al, Take a hack saw to it and report.
The nice part is no worries about cutting off the front sight. With this test you only need enough accuracy to miss your chrony.
Reply With Quote
  #10  
Old 10-09-2021, 05:51 PM
Toomany22s's Avatar
Toomany22s is online now
NRA Member - Click Here To Join!

Join Date: 
Sep 2017
Location: 
Hoosierville
Posts: 
9,002
TPC Rating: 
100% (4)
Well , it seems to me, that a longer barrel would shrink the deviation inherent in 22 lr muzzle velocity and therefore would result in smaller groups given the same ammo , gun etc . So , even though its not said enough, “ longer is better
Reply With Quote
  #11  
Old 10-09-2021, 06:03 PM
jaia
NRA Member - Click Here To Join!

Join Date: 
Apr 2014
Posts: 
7,809
TPC Rating: 
100% (2)
I'm gonna disagree with you 2many.
MV spread is caused by variations in primer/powder combustion.
Rate of burn, amounts of propellants determine mv spread.
Extreme Spread, Standard Deviation is not decreased by barrel length. Only cartridge uniformity.

Last edited by jaia; 10-09-2021 at 06:19 PM.
Reply With Quote
  #12  
Old 10-09-2021, 06:05 PM
David Valdina
US Marines Veteran NRA Member - Click Here To Join!

Join Date: 
Aug 2004
Location: 
Barefoot Bay, Florida and Cape Cod, Massachusetts
Posts: 
3,723
TPC Rating: 
100% (4)
On BenchrestCentral, on barrel length & diameter.

A thread to look at:

http://benchrest.com/showthread.php?...iameter-for-BR
Reply With Quote
  #13  
Old 10-09-2021, 06:32 PM
Toomany22s's Avatar
Toomany22s is online now
NRA Member - Click Here To Join!

Join Date: 
Sep 2017
Location: 
Hoosierville
Posts: 
9,002
TPC Rating: 
100% (4)
Quote:
Originally Posted by jaia View Post
I'm gonna disagree with you 2many.
MV spread is caused by variations in primer/powder combustion.
Rate of burn, amounts of propellants determine mv spread.
Extreme Spread, Standard Deviation is not decreased by barrel length. Only cartridge uniformity.
Numbers dont lie. The slower they come out , the smaller the difference will be. The smaller the difference the closer the trajectory.

Youre talking about the cause, im talking about the results
Reply With Quote
  #14  
Old 10-09-2021, 06:55 PM
Rocinante's Avatar
Rocinante is online now
US Navy Veteran NRA Member - Click Here To Join!

Join Date: 
Apr 2007
Location: 
MN
Posts: 
799
TPC Rating: 
0% (0)
You can't just use one type of ammo and apply that to all .22 LR rounds.

As I said.......you'll get different results with different powders.

Some of today's rounds can take advantage of a long barrel for greater velocity due to improvements in powders.

If I'm just stating an obvious fact that everybody already knows, I apologize.
Reply With Quote
  #15  
Old 10-09-2021, 06:58 PM
David Valdina
US Marines Veteran NRA Member - Click Here To Join!

Join Date: 
Aug 2004
Location: 
Barefoot Bay, Florida and Cape Cod, Massachusetts
Posts: 
3,723
TPC Rating: 
100% (4)
Velocity differences and results on target.

I do not know. I am just thinking. And posting for discussion.

At high velocity, a 50 fps difference in velocity may not make as much difference on paper at 100 yards as a 50 fps difference at slow velocity. If I had to guess, I would think there would be less difference in bullet drop in the high velocity range than at the low velocity ranges.

Exaggerate this may help with a visual. Look at the ballistic curves as bullet velocity really drops off. From an almost flat horizontal line it transitions to an almost vertical line going downward. Now have bullets printing on paper. A few feet per second difference early on will have little difference but later on a lot of difference. My thinking.

A suggested test we can all do. Shoot some high speed ammo at 25, 50 and 100 yards, with the same point of aim. Then do the same, same point of aim, with slow ammunition. The composite combined groups will be tightest at 25 yards and wider as the distance increases.
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




All times are GMT -5. The time now is 11:16 AM.

Privacy Policy

DMCA Notice

Powered by vBulletin
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Search Engine Optimisation provided by DragonByte SEO (Lite) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright 2000-2018 RimfireCentral.com
x