ACOG users please step inside

[45R]

I currently running a 14.5" barrel with pinned MB and shooting M193 ammo with irons on a 50 yard zero.

Over the weekend I sighted my TA31F in at 50 yards. Will this get me close to the TA31Fs BDC at its listed ranges or do I need to zero at 100?

TIA

45R

[Jicko]

I m in the process of hunting down some real information from Trijicon's engineers. Stay tuned.

But for a starter, ACOG assumed that you zero @ 100. TA31F's BDC is based on a 14.5" barrel firing M193 with the ACOG mounted to the receiver via a TA51 mount. But I am in the process of verifying this, since I have measured the drops, and they don't line up.

03. 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).

By the way, it is *likely* that those drops are in meters..... so, zeroing should be @ 100m/110yds...
ECOS manual: http://www.trijicon.com/dmgnt_files/...COS_Manual.pdf

[CSTactical]

They are setup for a 100yds zero on the tip of the Chevron.

Mike @ CSGW

[Jim_KT]

+1

I've always done a 100yd zero with the TA50. POA tangent to the top of the dot.

[Jicko]

Here are the info I got from my Trijicon source:

Model TA31 was calibrated based on 62gr M855 (BC = .304) @ 3050fps.
The BDC is engineered for 100 meter ZERO.

Graduations are as follows-
200m 2.0moa
300m 4.1moa
400m 7.8moa
500m 12.6moa
600m 18.7moa
700m 26.4moa
800m 35.8moa


EDIT: TA11F is the same....

[45R]

Thanks for the technical info guys!

[45R]

Took the rifle and TA31F to the range this week. The BDC made hits at 3-400 meters pretty easy.

[CSTactical]

Also thanks for the orders.

Mike @ CSGW

[Shenaniguns]

Also thanks for the orders.

Mike @ CSGW

And thank you for the call back with the info tonight

[PRODRIVE]

zeroed at 25m with m855 using army zeroing target.