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Old December 31, 2013, 10:34 AM   #1
hulley
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Where to zero an AR15 in 6.8SPC

Hello all, my buddy wants me to zero his AR15 in 6.8SPC and was wondering what distance to do so. I zero my ARs in 5.56 at 50yds which is a tad high at 100yds but is on POA at 200yds.

His AR has a 16" barrel, equipped with an Eotech and 3x magnifier and be using SSA 110gr. He does not hunt and this is a personal protection firearm.

What you think? 50yd or 100yd Zero?
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Old December 31, 2013, 10:46 AM   #2
mehavey
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Quote:
...this is a personal protection firearm...
Then this is a straightforward battlezero problem

- Get rid of the 3X magnifier
- Zero at the military's 1,000 inches (~25m)
- Call it a day.
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Old December 31, 2013, 11:27 AM   #3
hulley
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Quote:
Then this is a straightforward battlezero problem

- Get rid of the 3X magnifier
- Zero at the military's 1,000 inches (~25m)
- Call it a day.
Pretty much what I told him but hey I'll go shoot his AR if he really wants me to. He has it in his head that he wants a 200yd zero but he only gave me 20rds to work with.
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Old December 31, 2013, 11:45 AM   #4
mehavey
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Quote:
...wants a 200yd zero ...
Then zero ~1¼-1½" under at 20.

Either way, put the circle point blank/center-of-mass and tell him to
quit thinking beyond that (in a hot zone/defensive situation).
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Old December 31, 2013, 11:52 AM   #5
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About 1-1.5" high @ 100yds-keeps you pretty flat to 200.
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Old December 31, 2013, 12:07 PM   #6
CTS
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1 inch high at 50 with that round will put you pretty close to back on zero at 200.

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Last edited by CTS; December 31, 2013 at 12:30 PM.
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Old December 31, 2013, 01:16 PM   #7
hulley
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Thanks for the replies, I'll go a little high at 50yds then see where I'm at at 200yds and call it good.

Slappy, you're in NE Ga.? I'm going to Elbert County gun club tomorrow, have you been there?
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Old December 31, 2013, 02:24 PM   #8
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I'm in the Athens area. Haven't been to Elbert county Gun club but I hear it's nice.
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Old December 31, 2013, 02:29 PM   #9
hulley
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Its a pretty nice place. 400yd rifle range, 50yd rimfire, 50yd pistol, idpa stations and probably a dozen clay stations and they do 3-D archery shoots during the off-season. I'm going with a buddy to shoot clays for the first time, I'm pretty excited to say the least.
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Old December 31, 2013, 02:38 PM   #10
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Sounds like fun. I haven't shot clays in years. I have a couple cases in the shed but no thrower. I am between Nicholson and Athens kind of out in the boonies, I shoot out in the field next to the house (powerline). I need to do a little work to get 100 yard set up so I don't have to jump the creek.
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Old December 31, 2013, 08:09 PM   #11
dean1818
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The 6.8 is a great round. Love my Bison Armory.

I do initial zero at 50 as well to get to 200.

That Pro hunter is one of the more accurate 6.8 bullets out there.

I am partial to the Hornady 120SST puts the piggies down quick
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Old January 1, 2014, 04:23 AM   #12
bcarver
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20 rounds

You said he is only giving you 20 rounds.
Do this.
Remove the upper. Remove the bolt. place upper in bags on bench. Aim at a paper plate through bore. move plate out until it is the size of the bore. Move sight to the plate while it is aligned. This is boresighted.
Now shoot one shot at a large target at 25 yards or meter(which ever your scope is calibrated for adjustment). Make your aimpoint is extremely small. Make sure you don't jerk the trigger. One great shot.
measure the x and Y axis(high/low and left/right).Do the math. On most scopes it is gonna be 16 clicks per inch. Now move the turrets the calculations you made. Move the target to 50. swab the bore a dry patch or snakebore. Take one great shot from the bags at a small aimpoint.{the corner of a one inch square}. Do the measurement for one inch high.
Paster the two holes. move the target to 100. swab the bore. take three slow shots with swabs between, no flintch, controlled breath, squeeze.
You should have three rounds dead on at 100. An alternative is one shot as before and make adjustments on each round. this can be harder at 100 yards.
This beats the heck three shot group average and move sights.
I have some guns dead on at range in three rounds.
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Old January 2, 2014, 09:00 AM   #13
hulley
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Ok so I got the rifle sighted in.....for the most part.
The owner told me he already had a 25yd zero so I was hoping to just come down a little bit......He was WAY off! The shortest distance on the rifle range was 50ryd, I had placed an 8" shoot-n-c target and had a friend on a scope looking for hits. I had to go 8-10" down and 8" right to hit the top of the outer ring on the 8"! After walking it in I had a dead center hit at 50yd which put me 1.5-2" high at 100yds, I was able to take two shots at 100yds before I ran out of ammo....Well, good enough for Gov't work!

bcarver, that is a great method but I didnt consider it thinking he already had a 25yd zero. When I realized how off he was I didnt bring anything to secure the upper for this method. I still got it done but would have felt much better with a few more rounds for consistancy.
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Old January 2, 2014, 04:47 PM   #14
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ammo cost

Good deal,
That should be good to go. He needs to do the final adjustment himself anyway. Some people look through scopes differently and it builds confidence.
I developed that method after a frustrating range session. There is a gun shop that sights in rifles in our area. And I noticed the guy only used 5 or 6 rounds. He writes the round count and range on each target. My personal best has been 3 rounds from a new mount. And one round for a preseason test fire. You just got to make sure the shots are dead solid and trust yourself,
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Old January 2, 2014, 09:44 PM   #15
tnelson31
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I did my 6.8 120 sst at 37 yards, did the initial sighting with the upper off and was zeroed in 5 shots, last two at zero.
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Old January 3, 2014, 08:35 AM   #16
Nathan
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Shoot 1 at 50. Adjust to be centered and +1" high.

Shoot 2 at 100. Adjust to be 3" high and centered.

Shoot 3 at 200, if possible, adjust to be centered on bullseye.

Shoot 3 at 200 to show you resultant zero.

There you go! 9 rounds!
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Old January 4, 2014, 12:18 AM   #17
dvdcrr
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My input, zero it at 220 yds and keep all shots that range or less. I would recomend the 120 gr. bullets with MAX safe loads and a 20" barrel. I shot a big buck with one behind the shoulder at 150 yds. He just kind of humped up and walked down the hill. He was still standing there a minute later when I got up there to finally put him down with the second shot. Did the 16" carbine with 110 gr. loads at about 2600 fps get the job done? Yes. With authority? No. I view it as an anemic 30-30. I view it as a short range proposition, the round is really helped by a longer 20" barrel contrary to common misconception.
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Old January 4, 2014, 03:10 PM   #18
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I killed two large does with my 6.8 with 110gr sierra Pro Hunters, both at 90-100 yards and both through the vitals. 30-40 yards and they piled up. 6.8 is my main white tail round. Nothing wrong with it. Much better performance than a 30-30.
It really shines with the lighter loads, 85-90 at around 3k fps.
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