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Rifle Scopes Acog TA11H308 review

problemchild

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Jun 11, 2009
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Bought an Acog and thought I would post a mini review for your reading pleasure.

I could not find any review of this scope before my purchase so here is my own review after taking it to the range. I mounted the Acog TA11H-308 on my LMT 308 and headed for the range. The nearby range is limited to 200 yards on the weekend.

After sighting in at 50yds I moved to 100 yds and fine tuned the rifle/scope alignment. Getting the scope dead on at 100yds I moved the body target out to 200yds. I then proceeded to hammer 50 rds into the body of the target after which I finished off with 5rds into the head. Then I had my buddy shoot 5rds into the head. I used a spotting scope in between to mentally mark the 1st 5rds I had shot to the head. The 5rd group I shot in the head (circled) measured 1.15". It is also a 4.5" drop from red circle to middle of circled 5 shot group. I was using 155smk(non-palma) with 41.3 xbr Not bad for a horseshoe-dot tritium scope. With the PWS brake I could watch my hits at 200 yds. Pretty awesome drilling the target and hitting it every time with ease.

Please note I was aiming at the red circle to see how much bullet drop I was getting at 200. I essentially put the scopes red dot on the targets red dot. The scope has hold over ticks that I will try at Angeles shooting range next weekend on steel out to 600yds.

Overall I am really happy with the scope and the optics are very clear. The optics clarity remind me of Zeiss binoculars.

One last point I need to mention. I inquired in several posts if this scope would be good for a shooter with Astigmatism and everyone said it would not and the scope was for "young eyes only". I guess the "no-go" advice is not true at least for this model of the Acog.

And finally I must mention Scott at libertyoptics.com for his help with the purchase. I had numerous questions and Scott answered all of them. I placed the order and Scott shipped same day. He is a great guy and runs a great company in the awesome state of Montana.

Some pictures......


Its difficult to see but there is a red chevron post on top of the vertical reticle that can be used for precise aiming.
Also the horizontal lines at 4-5-6-7-800 yards are the width of a two legged target allowing easy ranging and holdover.
TA11H-308_RedHorse-web.jpg


IMG_1448a.jpg


_U6L0488b.jpg
 
Re: Acog TA11H308 review

Nice write up, nice photos, and nice looking dog! lol...

I'm intrigued with Acogs, but a little leary, I've heard they take some getting used to. Was this your first Acog, and how long would you say it takes to get used to it?

My impression about the time it takes (trying not to speak for others) is about the BAC aspect of using both eyes open with a magnafied optic. I can imagine it takes some practic to use both eyes when one image is magnafied.

Thanks for posting~
 
Re: Acog TA11H308 review

I thought the same thing but actually it took no getting used to at all. I always shoot with both eyes open with every gun I own so it was natural for me to shoot the Acog. Also the TA11 series has almost 4" of eye relief.



<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: MeridianNW</div><div class="ubbcode-body">Nice write up, nice photos, and nice looking dog! lol...

I'm intrigued with Acogs, but a little leary, I've heard they take some getting used to. Was this your first Acog, and how long would you say it takes to get used to it?

My impression about the time it takes (trying not to speak for others) is about the BAC aspect of using both eyes open with a magnafied optic. I can imagine it takes some practic to use both eyes when one image is magnafied.

Thanks for posting~
</div></div>
 
Re: Acog TA11H308 review

I've been trying out a TA11JG (green crosshairs) on an LMT MWS. I love the eye relief. The review is spot on. It's a great optic. I don't want give this rifle back to my dad when I go home next week. Glad he likes to share. I like my TA31 on my carbine , but I had to do it again it would be a TA11.
 
Re: Acog TA11H308 review

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: alpha6164</div><div class="ubbcode-body">Do you think 3.5X is enough for 400-800yards? Has anyone shot that far out with that low of power? </div></div>

I am positive its good to 500 with my old eyes. Maybe a 20 something gunho could shoot to 800. It would be more about reloading a round that followed the BDC drop rate exactly at that distance.
 
Re: Acog TA11H308 review

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: problemchild</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: alpha6164</div><div class="ubbcode-body">Do you think 3.5X is enough for 400-800yards? Has anyone shot that far out with that low of power? </div></div>

I am positive its good to 500 with my old eyes. Maybe a 20 something gunho could shoot to 800. It would be more about reloading a round that followed the BDC drop rate exactly at that distance. </div></div>



Is it specified anywhere, what load velocity that BDC is made for? Or better what MOA those cross hatches represent?
 
Re: Acog TA11H308 review

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Is it specified anywhere, what load velocity that BDC is made for? Or better what MOA those cross hatches represent? </div></div>

Trijicon states (and I have got 2 different answers) 22" 2810fps 175gr

So I searched fps loss per inch of barrel length.

Found this......
Read the articles on the DSARMS web site. I think these are the velocities...

22" barrel (i.e. M14/M1A) ~ 2800fps
20" barrel (i.e. std FAL) ~ 2600fps
16" barrel (i.e. 16 in FAL) ~ 2300fps

Then I found this......
OK folks, here's the facts. I have a 16" FAL (built by Arizona Response Systems) and a 21" L1A1 by Century. Chronograph numbers:

Radway Green:
21" FAL - 2693fps (30 shot average)
16" FAL - 2645fps (10 shot average)

Portugese FNM:
21" FAL - 2663fps (5 shot average)
16" FAL - 2599fps (5 shot average)

Then this......

A 20" barrel with 168gr FGMM BTHP is about 2665 fps
18" = 2631
16" = 2580

And this..........
M1A with cut down barrel
26 2826 fps 3,192 2240 2,005
24 2722 fps 2,961 2149 1,846
22 2713 fps 2,942 2141 1,832
20 2677 fps 2,864 2109 1,778
18 2654 fps 2,815 2089 1,744
16 2552 fps 2,603 2000 1,599

So who to believe??

My own drop at 200 yards was aprox 4-4.5 inches on a 155gr and when I reverse lookup the drop it shows a speed of 2450fps with 41.3grs XBR which is a decrease of aprox. 200fps from 20".

IMR load data show speed and the barrel length is supposed to be 20".

155 GR.(.443 coef.) SIE HPBT IMR IMR 8208 XBR .308" 2.775" 41.0 2619 47,300 PSI 45.3 2854 60,900 PSI

With my sight ht. at 2.25" (Acog center eyepiece elevation above stock cheek weld) I get a 4.46 drop at 200 which is exactly what I was seeing at the range. Meaning I am losing 200 fps with a 155gr bullet. I will have to do the math and ballistics on a 175gr next time I am at the range.

But if the 175 is a 200fps (between 20 and 16" not 22") loss as well we could assume the following.

Assuming .496 between 2800 and 1800 fps the drop from a 22 inch barrel is an unknown. I can get ballistics for a 20" barrel which show a -64 inch difference at 800 yards (-231 vs -167 for higher velocity)
 
Re: Acog TA11H308 review

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: problemchild</div><div class="ubbcode-body">
Trijicon states (and I have got 2 different answers) 22" 2810fps 175gr
</div></div>



Someone is smoking crack at Trijicon if they think they are getting 2800+ft/sec out of a 22" barrel with 175gr bullet. Standard 175gr factory is ammo is ~2600ft/sec give or take 30-50ft/sec depending on barrel length. That definitely absolutely does not make sense what they told you.
 
Re: Acog TA11H308 review

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: alpha6164</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: problemchild</div><div class="ubbcode-body">
Trijicon states (and I have got 2 different answers) 22" 2810fps 175gr
</div></div>



Someone is smoking crack at Trijicon if they think they are getting 2800+ft/sec out of a 22" barrel with 175gr bullet. Standard 175gr factory is ammo is ~2600ft/sec give or take 30-50ft/sec depending on barrel length. That definitely absolutely does not make sense what they told you. </div></div>

Actually I was wondering why it was so high. I was going to ask what you guys thought but I forgot.

I read a lot of posts that say a gas gun will lose 23fps per inch. Sound about right? Does the military have a gun with a 22" barrel that the ta11 mounts on? I thought SPR was shorter.

Trijicon was quoting a 147gr I bet.
 
Re: Acog TA11H308 review

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: problemchild</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: alpha6164</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: problemchild</div><div class="ubbcode-body">
Trijicon states (and I have got 2 different answers) 22" 2810fps 175gr
</div></div>



Someone is smoking crack at Trijicon if they think they are getting 2800+ft/sec out of a 22" barrel with 175gr bullet. Standard 175gr factory is ammo is ~2600ft/sec give or take 30-50ft/sec depending on barrel length. That definitely absolutely does not make sense what they told you. </div></div>

Actually I was wondering why it was so high. I was going to ask what you guys thought but I forgot.

I read a lot of posts that say a gas gun will lose 23fps per inch. Sound about right? Does the military have a gun with a 22" barrel that the ta11 mounts on? I thought SPR was shorter.

Trijicon was quoting a 147gr I bet. </div></div>









I am thinking you are right that they are quoting M80 ball projectile. I just dont know if you still get 2800ft/sec out of factory M80. Not sure.
 
Re: Acog TA11H308 review

Hornady 155-gr A-Max Match goes 2803 out of mine and gives better accuracy than I could ever reliably get with ANY 155-gr reload.

FGMM 175s go about 2550-2580.

My *old* load of 168 SMKs with 43.0 WW 748 was within 0.5 MOA of my *old* 147-gr loads. Speed vs. BC = same for drop.

The wind, my friends, was where the difference was seen.
 
Re: Acog TA11H308 review

Problemchild,

Thanks for the post and for mentioning us. Maybe the actual drop values for the vertical scale would be helpful?

In the TA11H-308....

4.2 moa to 300 meters (top tip of BDC vertical post)
7.6 to 400
11.7 to 500
16.6 to 600
22.4 to 700
29.2 to 800
37.2 to 900
46.4 to 1000
56.7 to 1100
68.0 to 1200

Scott