Main Menu
Advertisement
Affiliates
Advertisement
Newest Members
ScentBlaster, hutch6464, tailchaser93, mc2841, Bige18675
61688 Registered Users
Top Posters
dogcatcher 80983
stxranchman 52092
RWH24 44568
rifleman 44066
BOBO the Clown 41973
BMD 40612
bill oxner 37518
Big Orn 37484
txshntr 34253
sig226fan (Rguns.com) 31157
facebook
Forum Stats
61688 Members
46 Forums
425533 Topics
5872216 Posts

Max Online: 16728 @ 03/25/12 08:51 AM
Topic Options
#6110545 - 12/30/15 07:57 PM ACOG TA01 with 75 grain ammo
magspa Online   content
Bird Dog

Registered: 01/15/12
Posts: 404
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?
_________________________

Top
#6110556 - 12/30/15 08:01 PM Re: ACOG TA01 with 75 grain ammo [Re: magspa]
Dalee7892 Online   content
Pro Tracker

Registered: 05/04/15
Posts: 1526
Loc: Denton County
Pull up the info for the ballistics on each round from mfg. compare the drop for each distance.

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

Registered: 01/06/11
Posts: 20471
Loc: Rowlett, Tx
What kind of yardage are you talking about using the reticle out to?

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

Registered: 01/15/12
Posts: 404
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.
_________________________

Top
#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: 2779
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

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

Registered: 01/15/12
Posts: 404
Those are the manufacturer printed numbers.
_________________________

Top
#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: 2779
So for ideal data you need velocity from you barrel. The Hornady data is out of a 24in barrel

Top
#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: 2779
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

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

Registered: 01/15/12
Posts: 404
thanks Cleric!
_________________________

Top



© 2004-2016 OUTDOOR SITES NETWORK all rights reserved USA and Worldwide