Firearm & Gun Forum - FireArmsTalk.com > Long Guns > Auto & Semi-Auto Discussion > Velocity Question

Reply
 
LinkBack Thread Tools Display Modes
Old09-25-2010, 06:12 AM #1
Senior Member
 
AusLach's Avatar
 
Join Date: Jun 2010
Location: Coffs Harbour, New South Wales
Posts: 1,556
DefaultVelocity Question

Forgive me for what may be a stupid question but I have no experience with autoloaders so you'll have to put up with my ignorance!

Does the cycling system on a semi-automatic firearm rob the bullet of velocity when compared to the same load being fired out of a bolt gun?? If so is there any noticable difference in on-target bullet performance or tragectory?

I would have thought that seeing as though some of the energy that usually propels the bullet out of the barrrel now cycles the action to prepare for the next shot, the bullet would leave the barrel noticable slower. Or is the reloading action so effficient that there is negligable velocity difference between semi's and bolt guns?

Thanks for your help, I wish I had access to an AR, SKS et al to find out for myself, but unfortunately I don't so you guys are my next best option!
AusLach is offline  
 
Reply With Quote

Join FirearmsTalk.com Today - It's Free!

Are you a firearms enthusiast? Then we hope you will join the community. You will gain access to post, create threads, private message, upload images, join groups and more.

Firearms Talk is owned and operated by fellow firearms enthusiasts. We strive to offer a non-commercial community to learn and share information.

Join FirearmsTalk.com Today! - Click Here


Old09-25-2010, 01:24 PM #2
Member
 
GNLaFrance's Avatar
 
Join Date: Sep 2008
Location: Baltimore, Maryland
Posts: 61
Default

No, there's no loss of velocity. In a semi-automatic, the bullet is long gone by the time the action begins to move.
GNLaFrance is offline  
 
Reply With Quote
Old09-27-2010, 04:38 PM #3
Moderator
 
robocop10mm's Avatar
 
Join Date: Jul 2007
Location: Austin, Texas, by God!!
Posts: 6,061
Default

In a gas operated rifle, there is a slight loss of pressure through the gas port. This will lead to a slightly lower velocity. The loss will not be significant. Barrel length and internal barrel finish will likely account for more difference.
__________________
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball
robocop10mm is offline  
 
Reply With Quote
Old09-30-2010, 01:57 AM #4
Senior Member
 
Join Date: Aug 2010
Location: DALLAS, TEXAS
Posts: 170
Default

there is a loss yes
it does affect the accuracy
noticeable would have alot of factors that were depending on....
grain of the bullet, type of powder (ball or stick), length of the barrel, type of the rifling, and etc..
i think to best research this topic yourself i would look at 7.62nato (.308 win) because of the diverseness of the round as well as the ballastic info that is available.
pranc2 is offline  
 
Reply With Quote
Reply
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Firearms Forum Replies Last Post
barrel length and velocity? planenut General Handgun Discussion 4 03-29-2010 03:22 AM
Penetration - velocity vs size planenut Ammunition & Reloading 7 03-19-2010 09:52 PM
Want to know what your gun gets in velocity? Gojubrian General Handgun Discussion 3 11-18-2009 04:03 PM
Help - 20"bbl velocity hillbilly68 General Rifle Discussion 2 10-15-2008 11:51 PM
Max Range/Velocity? metroid Blackpowder & Musket 2 08-03-2007 06:21 PM



FOLLOW US ON
PHOTO OF THE DAY
SA1911A1 & Ruger Mark II Target & my range box



Network: Kel Tec Forum - Airsoft Forum - Hipoint Firearms Forum - Glock Forum - Marlin Forum