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Page AR-15 » AR Discussions
AR Sponsor: bravocompany
Posted: 4/23/2007 12:08:21 PM EDT
Does anyone have any specs on effective distance and accurancy in relation to barrel length?

I've been told that with a 20" barrel you can expect to keep tight groups out to around 800m.  And with a standard 16" barrel you can keep groups at around 400m.  Does this sound right?

What about with a 14.5" barrel?

Does anyone have any experience or ideas?
Link Posted: 4/23/2007 12:13:05 PM EDT
[#1]
Formulas are bullshit.

Search.
Link Posted: 4/23/2007 12:37:27 PM EDT
[#2]
Barrel length is not relative to accuracy.
What matters is; bolt relationship to extension, chamber, throat, land and groove cut quality, bore smoothness, barrel straightness, metallurgical reaction to heat, projectile match to barrel, consistency in velocity, and crown.
Consistency is the key to maintaining a common impact point. Anything that changes in your weapon as you fire (including you), will effect the impact point of your projectile. But....barrel length will not make a difference.
One note -higher velocities, if consistent, will allow for less wind and drop effects.
ETA; Higher velocities will extend the rounds fragmentation threshold. Some say 2700 fps is the limit, but the projectile construction will determine that.
Link Posted: 4/23/2007 12:58:20 PM EDT
[#3]
Thanks Walker_18B.  So, what you're saying is that provided all things are constant with regard to extension, chamber, throat, land and groove cut quality, bore smoothness, barrel straightness, metallurgical reaction to heat, projectile match to barrel, consistency in velocity, and crown...I should be able to hit a target at 800m with 14.5" barrel or a 20" barrel...it doesn't matter?  
Link Posted: 4/23/2007 1:27:56 PM EDT
[#4]
Yes you'll hit it, but the longer barrel will have less drop, be less effected by wind, and will carry more ft lbs of impact. Neither will have enough to fragment the round though. ie. Knitting Needle Wounds.
Page AR-15 » AR Discussions
AR Sponsor: bravocompany
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