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#6110545 - 12/30/15 07:57 PM ACOG TA01 with 75 grain ammo
magspa Offline
Bird Dog

Registered: 01/15/12
Posts: 414
Any ar gurus here? I got a TA01 at a great price..problem is i like those hornady superperformance 75 grain HP's. They are pretty fast for 75grain (2910 fps) but the optic bdc is caliberated for the 55 grain ammo in a 20" barrel. Im putting it on a 16" 1:7 twist. How far off do you think the bdc will be?
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#6110556 - 12/30/15 08:01 PM Re: ACOG TA01 with 75 grain ammo [Re: magspa]
Dalee7892 Offline
Pro Tracker

Registered: 05/04/15
Posts: 1565
Loc: Denton County
Pull up the info for the ballistics on each round from mfg. compare the drop for each distance.

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#6110853 - 12/30/15 10:31 PM Re: ACOG TA01 with 75 grain ammo [Re: magspa]
Gravytrain Offline
THF Celebrity

Registered: 01/06/11
Posts: 20898
Loc: Rowlett, Tx
What kind of yardage are you talking about using the reticle out to?

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#6110974 - 12/31/15 05:33 AM Re: ACOG TA01 with 75 grain ammo [Re: Dalee7892]
magspa Offline
Bird Dog

Registered: 01/15/12
Posts: 414
Originally Posted By: Dalee7892
Pull up the info for the ballistics on each round from mfg. compare the drop for each distance.


I pulled them and they are very similar actually. The 75grain has more velocity after 200yards.
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#6111082 - 12/31/15 07:32 AM Re: ACOG TA01 with 75 grain ammo [Re: magspa]
Cleric Offline
Veteran Tracker

Registered: 03/11/12
Posts: 2780
Is the velocity from your gun or printed on the box? That velocity seems really high...


Put your velocity into a drop calculator than go to trijicons web site and look up the spacing on the reticle

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#6111188 - 12/31/15 08:27 AM Re: ACOG TA01 with 75 grain ammo [Re: magspa]
magspa Offline
Bird Dog

Registered: 01/15/12
Posts: 414
Those are the manufacturer printed numbers.
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#6111500 - 12/31/15 11:03 AM Re: ACOG TA01 with 75 grain ammo [Re: magspa]
Cleric Offline
Veteran Tracker

Registered: 03/11/12
Posts: 2780
So for ideal data you need velocity from you barrel. The Hornady data is out of a 24in barrel

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#6111923 - 12/31/15 03:14 PM Re: ACOG TA01 with 75 grain ammo [Re: magspa]
Cleric Offline
Veteran Tracker

Registered: 03/11/12
Posts: 2780
If this data on sub tension is right...

100m 0"
200m 1.5'
300m 4.5'
400m 8.0'
500m 12.75'
600m 18.75'

Assuming 200 fps lost for 8 inches your velocity should be 2700 off published data with 2.5in offset for scope

1.5 is 200 yards
4.5 is approx 320
8 is approx 425
12.75 is approx 530

Ymmv

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#6112129 - 12/31/15 05:14 PM Re: ACOG TA01 with 75 grain ammo [Re: magspa]
magspa Offline
Bird Dog

Registered: 01/15/12
Posts: 414
thanks Cleric!
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