Is there industry consistancy in how muzzle velocity tested? - M14 Forum

M14 Forum


Is there industry consistancy in how muzzle velocity tested?

This is a discussion on Is there industry consistancy in how muzzle velocity tested? within the Ammunition forums, part of the M14 M1A Forum category; That is... Do all manufacturers use a standard of a 22" barrel or a 24", or some such standardization that they base their muzzle velocity ...


Go Back   M14 Forum > M14 M1A Forum > Ammunition

Reply
 
LinkBack Moderator Tools Display Modes

Old March 7th, 2017, 07:03 AM   #1
Squad Leader
 
Walt Longmire's Avatar
 
Join Date: Nov 2016
Location: CO & WY
Posts: 237
Is there industry consistancy in how muzzle velocity tested?

That is...
Do all manufacturers use a standard of a 22" barrel or a 24", or some such standardization that they base their muzzle velocity stats on?

I am wondering because I understand that velocities are reduced as the barrel get shorter by some 25'ish FPS per inch, which means a M1A standard is going to get better velocity than my Scout by approximately 100fps give or take... but, while that may be true and an easy calculation, is it accurate to say that is the calculation between what is on the MFG box / website - and what the velocity out of my Scout might / should be?.. or is it even less because of some standard test parameter with a longer barrel?

My issue is that for ballistic calculation I know velocity is pretty important - but seeing as I don't have access to a chronograph since I stopped playing paintball and airsoft regularly some 15'ish years ago, nor know anyone with one for that matter anymore, I am trying to figure out a way to do a basic calculation model for what velocities should be, roughly, comparative to MFG listings.

Does that make sense what I'm asking / trying to do?

Walt Longmire is offline  
Remove Ads
Old March 7th, 2017, 09:10 AM   #2
wxl
Designated Marksman
 
Join Date: Feb 2014
Location: South Texas
Posts: 593
Most ammo specs (not all) specify velocity for barrel length. But you may have to Goggle as often description may be abbreviated by vendors.

wxl is offline  
Old March 7th, 2017, 09:11 AM   #3
Squad Leader
 
Walt Longmire's Avatar
 
Join Date: Nov 2016
Location: CO & WY
Posts: 237
Okay,

I think I found it - after giving myself a migraine reading the SAAMI information here:
http://www.saami.org/specifications_...wnload/206.pdf
It would appear on page 306, if I am reading it correctly, that all .308 rounds are tested using a 24" barrel with a 1:12 rifling.

Now - is my assertion of a 25'ish fps drop per inch of barrel reduction an accurate (enough) estimation to say that rounds claiming 2680fps would ACTUALLY be, for me with my Scout, would more likely be something like 2530fps?

Walt Longmire is offline  
Reply

  M14 Forum > M14 M1A Forum > Ammunition

Moderator Tools
Display Modes


Similar M14 Forum Discussions
Thread Thread Starter Forum Replies Last Post
muzzle velocity? beanpool Ammunition 14 September 23rd, 2006 01:13 PM
SOCOMs and Muzzle Velocity Nemesis The M14 0 July 18th, 2006 10:30 PM
How to swap a muzzle brake for a flash hider Different The M14 0 June 27th, 2006 02:37 PM
Smith Vortex vs Muzzle Brake Fro The M14 9 January 20th, 2006 08:25 PM
Handgun Muzzle Velocity vs. Barrel Length 6016mech Handguns 7 December 30th, 2005 05:25 PM



Top Gun Sites Top Sites List