User Panel
User Panel
User Panel
|
Posted: 5/8/2018 3:46:33 PM EDT
[#1]
Quoted:
Bought an ACOG at a Pawn Shop recently. Got a very good deal on it. When I bought it I assumed it was either a 5.56 or even a .308- no box, no paperwork with it etc.....Turns out its calibrated for the fucking worthless 6.8. Any other model I could use- .300/7.62x39, .308, .223.....but the fucking 6.8 is completely fucking useless to me. Probably why they pawned an ACOG- Nobody wanted it.... Figures. Probably put the stupid thing on Ebay and go buy something I can actually use. I have a 6.8 and wish I could afford an acog. 
|
|
|
|
Posted: 5/8/2018 4:09:05 PM EDT
[#2]
Put your dope in a ballistic calculation app like strelok, you can probably figure out a good place to zero the reticle that makes it useful. Plenty of people figure out ways to make 5.56 BDC work with their 6.8 rifles or even more oddball cartridges. Same goes for making your 10.5" SBR work with a BDC designed for a 20" barrel. It's not gonna be perfect super sniper accurate but maybe close enough to get rounds on a man-size target. I stuck the default M193 @ 3165 fps in with your reticle, put a 50yd zero in on a hunch, then adjusted it to 55yds and came up with this which gets you pretty much on target out to 900yds just with everything shifted one crosshair above where the numbers say it is. With a little messing around you can probably come up with something similar for whatever bullet and barrel length you shoot most often, then fine tune it by confirming out at 400yds or something.
|
|
|
|
Posted: 5/8/2018 4:16:29 PM EDT
[#3]
Quote HistoryQuoted:
Put your dope in a ballistic calculation app like strelok, you can probably figure out a good place to zero the reticle that makes it useful. Plenty of people figure out ways to make 5.56 BDC work with their 6.8 rifles or even more oddball cartridges. Same goes for making your 10.5" SBR work with a BDC designed for a 20" barrel. It's not gonna be perfect super sniper accurate but maybe close enough to get rounds on a man-size target. I stuck the default M193 @ 3165 fps in with your reticle, put a 50yd zero in on a hunch, then adjusted it to 55yds and came up with this which gets you pretty much on target out to 900yds just with everything shifted one crosshair above where the numbers say it is. With a little messing around you can probably come up with something similar for whatever bullet and barrel length you shoot most often, then fine tune it by confirming out at 400yds or something. https://files.catbox.moe/7nc9if.png |
|
|
|
Posted: 5/8/2018 4:49:18 PM EDT
[#4]
Perhaps you may find that for utility reflex shooting, that using Maximum Point Blank Range zero technique may be the way to go in your situation.
|
|
|
|
Posted: 5/8/2018 5:07:13 PM EDT
[#5]
Sounds like an excuse to build a 6.8spc AR to me.
|
|
|
|
Posted: 5/8/2018 6:14:23 PM EDT
[#6]
Quote HistoryQuoted:
Sounds like an excuse to build a 6.8spc AR to me. |
|
|
|
Posted: 5/8/2018 6:48:16 PM EDT
[#7]
Is it the ta31h-68?
|
|
|
|
Posted: 5/8/2018 6:49:57 PM EDT
[#8]
Quote HistoryQuoted:
Is it the ta31h-68? |
|
|
|
Posted: 5/8/2018 8:04:44 PM EDT
[#9]
6.8 will be very close to 7.62x39mm and .300 Blackout.
I would zero it at 300 yards using the 300 yard hash mark and check to see how close it hits at 100/200 to clear up any doubt. |
|
|
|
Posted: 5/8/2018 8:30:50 PM EDT
[#10]
You’re nitpicking over what’ll most likely amount to nothing. It’s a BDC. It’s calibrated for a specific load, at a specific velocity, in specific environmental conditions. If you fiddle with your zero distance and factor in your specific load and environmental conditions, you can most likely end up closer to what you want than if you used the “correct” BDC in an environment or with a velocity/projectile it isn’t calibrated for.
ETA: Here’s your reticle, zeroed at 50y, with 123gr 7.62x39 traveling at roughly 2500fps. Closer than any of the 6.8 factory loads I’ve tried in Strelok.  Attached File |
|
|
|
Posted: 5/8/2018 8:32:30 PM EDT
[#11]
Quote HistoryQuoted:
You're nitpicking over nothing. It's a BDC. It's calibrated for a specific load, at a specific velocity, in specific environmental conditions. If you fiddle with your zero distance and factor in your specific load and environmental conditions, you can most likely end up closer to what you want than if you used the "correct" BDC in an environment or with a velocity it isn't calibrated for. |
|
|
|
Posted: 5/8/2018 8:41:27 PM EDT
[#12]
Quote HistoryQuoted:
You’re nitpicking over what’ll most likely amount to nothing. It’s a BDC. It’s calibrated for a specific load, at a specific velocity, in specific environmental conditions. If you fiddle with your zero distance and factor in your specific load and environmental conditions, you can most likely end up closer to what you want than if you used the “correct” BDC in an environment or with a velocity/projectile it isn’t calibrated for. |
|
|
|
Posted: 5/8/2018 9:05:11 PM EDT
[#13]
Yes, x39 was pretty close out to 300 yards from what I could see even though most of it runs about 2300 fps.....
Maybe it's just me, but I've had really good luck with my BDCs in terms of them being on out to 400...at 500 not as close but that's really stretching m193 anyway. |
|
|
|
Posted: 5/8/2018 10:08:42 PM EDT
[#14]
|
|
|
|
Posted: 5/8/2018 10:38:26 PM EDT
[#15]
What did you pay for it?
|
|
|
|
Posted: 5/8/2018 10:40:58 PM EDT
[#16]
Quote HistoryQuoted:
https://www.AR15.Com/media/mediaFiles/354072/Screenshot_20180508-180728-538006.JPG looks like it would work well for a 77 gr SMK out of an M4 barrel. |
|
|
|
Posted: 5/8/2018 10:41:29 PM EDT
[#17]
Quote HistoryQuoted:
What did you pay for it? |
|
|
|
Posted: 5/8/2018 11:07:41 PM EDT
[#18]
Quote HistoryQuoted:
You’re nitpicking over what’ll most likely amount to nothing. It’s a BDC. It’s calibrated for a specific load, at a specific velocity, in specific environmental conditions. If you fiddle with your zero distance and factor in your specific load and environmental conditions, you can most likely end up closer to what you want than if you used the “correct” BDC in an environment or with a velocity/projectile it isn’t calibrated for. ETA: Here’s your reticle, zeroed at 50y, with 123gr 7.62x39 traveling at roughly 2500fps. Closer than any of the 6.8 factory loads I’ve tried in Strelok. https://www.AR15.Com/media/mediaFiles/294984/D18E59D1-EEA4-4351-9C0C-F1AE44619EEF-537918.JPG |
|
|
|
Posted: 5/8/2018 11:18:27 PM EDT
[#19]
Quote HistoryQuoted: $600 It seems the calculators shown too are pretty damn close too. Enjoy it OP. |
|
|
|
Posted: 5/10/2018 6:18:20 AM EDT
[#20]
6.8 seems to be very close in trajectory to 6.5 Grendel, until you get out there a ways. Just something to consider.
|
|
|
|
Posted: 5/10/2018 6:45:33 AM EDT
[#21]
If you want to sell let me know. I might be in the market
|
|
|
|
Posted: 5/11/2018 3:13:55 PM EDT
[#22]
Quote HistoryQuoted: See if Trijicon will re-reticle it. I bet they will. It seems the calculators shown too are pretty damn close too. Enjoy it OP. With so many bullet weights/loads and barrel lengths, I consider the "caliber" designation on the ACOG BDC worthless until you match it up with your exact load/barrel length. But I don't shoot 800 yards with my ACOGs. |
|
|
|
Posted: 5/14/2018 1:02:10 PM EDT
[#23]
Quote HistoryQuoted:
...But it's worth a call to Trijicon. They have good CS. With so many bullet weights/loads and barrel lengths, I consider the "caliber" designation on the ACOG BDC worthless until you match it up with your exact load/barrel length. But I don't shoot 800 yards with my ACOGs. Doing that would likely remove a bit of buyer's remorse seen ranted about on the net. It's what they do; they breathe this stuff. If one has a specific load worked up, or is wedded to a particular factory load, run the data, get your drops & engage Trijicon to see what they suggest. Someone who buys an RCO because "wow, dot-MIL!" and then shoots slo-mo krap ammo & can't hit their steel at 500 is an example that comes to mind. It can be avoided. 
|
|
|
|
Posted: 5/14/2018 6:22:03 PM EDT
[#24]
Not trying to hijack the thread, but since we are on the topic of used Acogs. I can pick up a TA01 for $500, is that a decent price?
|
|
|
|
Posted: 5/14/2018 7:41:13 PM EDT
[#25]
Quote HistoryQuoted:
Not trying to hijack the thread, but since we are on the topic of used Acogs. I can pick up a TA01 for $500, is that a decent price? Also depends if its an ex military acog. |
|
|
|
Posted: 5/14/2018 7:49:54 PM EDT
[#26]
While the range calibration is perhaps not right, keep in mind that the horizontal hashmarks are also sized for range estimation when you can't otherwise determine distance to the target.
If memory serves me right, the width of the hashmark is the width of a human torso at that range. |
|
|
|
Posted: 5/14/2018 8:15:37 PM EDT
[#27]
Quote HistoryQuoted: Sure, It can be made to work but the whole point of an ACOG to me is "point and shoot". You range the target, apply the correct hold line and pull the trigger. I'll just dump it, maybe break even if I'm lucky, and get something I can really use. Lesson learned and a pain in the ass to deal with but it was worth a chance. |
|
|
|
Posted: 5/15/2018 6:12:57 PM EDT
[#28]
surprised you didn't call trijicon and ask them about it before you purchased it?
|
|
|
|
Posted: 5/15/2018 7:37:04 PM EDT
[#29]
Quote HistoryQuoted:
$600 Quote HistoryQuoted:
Quoted:
What did you pay for it? |
|
|
|
Posted: 5/15/2018 9:12:01 PM EDT
[#30]
Quote HistoryQuoted:
surprised you didn't call trijicon and ask them about it before you purchased it? |
|
|
|
Posted: 5/16/2018 9:57:17 PM EDT
[#31]
Quote HistoryQuoted:
surprised you didn't call trijicon and ask them about it before you purchased it? |
|
|
|
Posted: 5/16/2018 10:03:51 PM EDT
[#32]
Quote HistoryQuoted: That's what I would have done. CID is always willing to take back stolen optics leaving you with the loss. I purchased an ACOG that turned out to be from the military. When I called them, it turns out Trijicon is pretty relaxed about it, unlike Aimpoint or Eotech. They won't warranty the optic, but I can still send it to them for paid repairs. They won't fix the laser filter if it breaks though. |
|
|
|
Posted: 5/17/2018 10:30:56 AM EDT
[#33]
|
|
|
Win a FREE Membership!
Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!
You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.
AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types.
From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm.
Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more.
Copyright © 1996-2024 AR15.COM LLC. All Rights Reserved.
Any use of this content without express written consent is prohibited.
AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own.
Attached File
Attached File