OpticsTalk by SWFA, Inc. Homepage SWFA     SampleList.com
Forum Home Forum Home > Scopes > Tactical Scopes
  New Posts New Posts RSS Feed - What bullet & barrel length for ACOG ?
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Visit the SWFA.com site to check out our current specials.

What bullet & barrel length for ACOG ?

 Post Reply Post Reply
Author
Message
Chris Farris View Drop Down
TEAM SWFA - Admin
TEAM SWFA - Admin
Avatar
swfa.com

Joined: October/01/2003
Location: Texas
Status: Offline
Points: 8024
Post Options Post Options   Thanks (0) Thanks(0)   Quote Chris Farris Quote  Post ReplyReply Direct Link To This Post Topic: What bullet & barrel length for ACOG ?
    Posted: November/09/2006 at 17:38

From Trijicon's web site FAQ

http://www.trijicon.com/faq.cfm 

We get asked all the time what barrel length or bullet weight Trijicon ACOG's are calibrated for, so I figured I would make a post for anyone that might be wandering. 

What bullet was used to calibrate the ACOG scopes?
    The TA01, TA11, & TA31 (.223) were designed for the 5.56mm, 20 inch barrel, 55 grain bullet, and M16/AR15 carry handle mount. The TA01B & TA11C(.308) were designed for the 7.62mm, 20 inch barrel, 168 grain bullet, and M16/AR15 carry handle mount. The TA01NSN was designed specifically for the US Special Operations Command SOPMOD M4 Carbine. To meet their requirements, the reticle bullet drop compensator and range finding stadia lines were based on the trajectory of the 62 grain bullet from a 14.5 inch barrel, flattop mount (Picatinny rail Mil.Std.1913).

Does bullet weight and/or barrel length effect the reticle bullet drop compensator and range finding stadia lines?
    The real issue is not the bullet weight or barrel length, but muzzle velocity, ballistic coefficient, and the distance from height above bore. The difference in trajectory from bullet to bullet or barrel to barrel is usually less then the MOA thickness of the stadia lines.



Edited by Chris Farris - December/26/2007 at 10:56
Back to Top
mercenary1947 View Drop Down
Optics Master
Optics Master
Avatar
**

Joined: April/02/2006
Location: United States
Status: Offline
Points: 1392
Post Options Post Options   Thanks (0) Thanks(0)   Quote mercenary1947 Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2008 at 21:52
 This post looked so lonely with no replies ... thought I'd just type one .... LOL
One Shot One Kill .... *S.O.F * Head Shots Only
               SWFAM
Back to Top
army_eod View Drop Down
Optics Journeyman
Optics Journeyman
Avatar

Joined: May/03/2006
Location: United States
Status: Offline
Points: 448
Post Options Post Options   Thanks (0) Thanks(0)   Quote army_eod Quote  Post ReplyReply Direct Link To This Post Posted: May/28/2008 at 10:15
That is good poop for guys like me who like to shoot the Hornady 75 grainers.  So you are saying it is insignificant for real world applications....like al Qaeda targets.
 
If you do ballistics tables for various 5.56/.223 loads you note that out to about 250-300 meters there is not much diff in POI.
Princes and governments are far more dangerous than other elements within society.

Niccolo Machiavelli
Back to Top
Brady View Drop Down
TEAM SWFA - Admin
TEAM SWFA - Admin
Avatar
Casino Cruiser

Joined: May/20/2004
Location: United States
Status: Offline
Points: 1844
Post Options Post Options   Thanks (0) Thanks(0)   Quote Brady Quote  Post ReplyReply Direct Link To This Post Posted: July/02/2008 at 13:29
Back to Top
opticsmike View Drop Down
Optics Apprentice
Optics Apprentice
Avatar

Joined: September/09/2008
Location: Amherst, NY
Status: Offline
Points: 185
Post Options Post Options   Thanks (0) Thanks(0)   Quote opticsmike Quote  Post ReplyReply Direct Link To This Post Posted: September/11/2008 at 01:17
You can't link directly to a post at ar15.com. And guess what, there's no way to search either. I don't understand that site Loco
Back to Top
Brady View Drop Down
TEAM SWFA - Admin
TEAM SWFA - Admin
Avatar
Casino Cruiser

Joined: May/20/2004
Location: United States
Status: Offline
Points: 1844
Post Options Post Options   Thanks (0) Thanks(0)   Quote Brady Quote  Post ReplyReply Direct Link To This Post Posted: September/11/2008 at 08:38
Back to Top
HiTechTactical View Drop Down
Optics GrassHopper
Optics GrassHopper
Avatar

Joined: February/26/2009
Location: Naples, FL
Status: Offline
Points: 2
Post Options Post Options   Thanks (0) Thanks(0)   Quote HiTechTactical Quote  Post ReplyReply Direct Link To This Post Posted: February/26/2009 at 18:44
I have an Acog replica which has a very similar reticle, and it was right on the hash marks out to 300 yds with my 16" barrel and handloaded 55gr FMJ.  Hash marks are great, but if you don't compensate for the wind.....
Back to Top
Chris Farris View Drop Down
TEAM SWFA - Admin
TEAM SWFA - Admin
Avatar
swfa.com

Joined: October/01/2003
Location: Texas
Status: Offline
Points: 8024
Post Options Post Options   Thanks (0) Thanks(0)   Quote Chris Farris Quote  Post ReplyReply Direct Link To This Post Posted: February/27/2009 at 08:56
I've never seen a signature with a scroll bar.
 
Welcome Hi Tech Tactical. 
Back to Top
Tilladaddy View Drop Down
Optics GrassHopper
Optics GrassHopper
Avatar

Joined: March/31/2009
Location: Texas
Status: Offline
Points: 1
Post Options Post Options   Thanks (0) Thanks(0)   Quote Tilladaddy Quote  Post ReplyReply Direct Link To This Post Posted: March/31/2009 at 06:11
I am looking to out fit my 6.8 spc with a 16" barrel. Are there any suggestions for any particular ACOG.
Back to Top
Chris Farris View Drop Down
TEAM SWFA - Admin
TEAM SWFA - Admin
Avatar
swfa.com

Joined: October/01/2003
Location: Texas
Status: Offline
Points: 8024
Post Options Post Options   Thanks (0) Thanks(0)   Quote Chris Farris Quote  Post ReplyReply Direct Link To This Post Posted: March/31/2009 at 08:53
http://www.swfa.com/p-14553-new-trijicon-4x32-acog-rifle-scope.aspx
 
The new 4x32 with the 6.8 reticle would be perfect.
Back to Top
55spartan View Drop Down
Optics Apprentice
Optics Apprentice


Joined: March/07/2010
Location: Indiana
Status: Offline
Points: 54
Post Options Post Options   Thanks (0) Thanks(0)   Quote 55spartan Quote  Post ReplyReply Direct Link To This Post Posted: March/10/2010 at 20:31
so the ta31 would work on my 6920 correct???
Back to Top
cbox22 View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: March/19/2010
Location: California
Status: Offline
Points: 7
Post Options Post Options   Thanks (0) Thanks(0)   Quote cbox22 Quote  Post ReplyReply Direct Link To This Post Posted: March/20/2010 at 21:51
What replica are you using?
Back to Top
JF4545 View Drop Down
Optics Master
Optics Master
Avatar

Joined: March/31/2009
Location: Washington
Status: Offline
Points: 2753
Post Options Post Options   Thanks (0) Thanks(0)   Quote JF4545 Quote  Post ReplyReply Direct Link To This Post Posted: March/21/2010 at 18:22
Originally posted by Tilladaddy Tilladaddy wrote:

I am looking to out fit my 6.8 spc with a 16" barrel. Are there any suggestions for any particular ACOG.
 
 
I have a RRA 6.8 AR as weel and Im also looking for a appro. ACOG. Chris the web page above does not open for me, !?  Is it the 4X32 ACOG with Horseshoe reticle?
Back to Top
Chris Farris View Drop Down
TEAM SWFA - Admin
TEAM SWFA - Admin
Avatar
swfa.com

Joined: October/01/2003
Location: Texas
Status: Offline
Points: 8024
Post Options Post Options   Thanks (0) Thanks(0)   Quote Chris Farris Quote  Post ReplyReply Direct Link To This Post Posted: March/22/2010 at 09:53
Back to Top
Rancid Coolaid View Drop Down
MODERATOR
MODERATOR
Avatar

Joined: January/19/2005
Location: United States
Status: Offline
Points: 9318
Post Options Post Options   Thanks (0) Thanks(0)   Quote Rancid Coolaid Quote  Post ReplyReply Direct Link To This Post Posted: March/22/2010 at 10:17
Stupid, "It doesn't need to be said" post:  be sure you fire YOUR rifle with YOUR bullets at a known distance range prior to "assuming" a scope marked 400 yards is an actual 400 yards with your setup.

I've been on the range more than once with a guy shooting something "calibrated" but not on paper.  They are usually confused as hell with something like, "It was on at 100, why would it be off at 200 or 300?"

The only "calibrated" and dead-nuts solution is your actual, real-world data, with your rounds, from your gun, in your specific shooting environment.  Everything else is generic - which might be dead-on and might not.
Freedom is something you take.
Respect is something you earn.
Equality is something you whine about not being given.
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.01
Copyright ©2001-2018 Web Wiz Ltd.

This page was generated in 0.168 seconds.