Burris Eliminator 3 question.....

Mr. Poppadopalis

Mr. Poppadopalis

New member
I am shooting an AR Platform with a Wylde barrel with Hornady Superformance 53gr and an AAC .556 Can

I have it sighted in dead on at 100 yards, i shot it today missing a Coyote to the right at 441 yards.

I then decided to resight it at 260 yards and it was 4 inches right and the elevation was perfect.

Moved the target to 175 yards and was 2 inches right and elevation was perfect.

No wind, what the heck is going on??

Thank you!!
 
Interesting. You're absolutely sure it's dead on at 100?

Did you have the scope on your 243 and it worked fine then?

If both of those are true, then it sounds like something is misaligned, either the scope to the rail, or the rail and the barrel aren't true to each other.

30 years ago a buddy had a super accurate 25-06 made with a Springfield action. He wanted to mount an old time Unertl scope on it, where one mount is on the barrel. Long story short, the smith did not get the front mount centered up correctly, and as a result windage was only ever zeroed at one range, and every other range was either left or right. Really pissed him off. Your problem reminds me of that.

I'd start by remounting the scope I guess, and giving everything a good once over. What are you using for a riser? I'm using a YHM one piece 1/2" riser for mine.
 
I have an Elimator scope and find the mounting is no where near as bullet-proof as I would like for hunting, although some may find it ok. Seems like I recall one mounting end (front or rear) is floating and thats the area that's suspect to me. Mine is mounted on a suppressed 308 bolt gun that shoots subsonic rounds only and it works fine for that purpose but its only a range fun gun. Perhaps that might be part of the problem. Otherwise, I'd check the rifle with another scope and if it shoots right in the same manner I'd then look at the barrel to receiver alignment. Might need to true the front of the receiver and/or the check the barrel where it fits into the receive for squareness. Just a guess or two....
 
Originally Posted By: Burnsome...I have an Elimator scope and find the mounting is no where near as bullet-proof as I would like for hunting, although some may find it ok. Seems like I recall one mounting end (front or rear) is floating and thats the area that's suspect to me. Mine is mounted on a suppressed 308 bolt gun that shoots subsonic rounds only and it works fine for that purpose but its only a range fun gun. Perhaps that might be part of the problem. Otherwise, I'd check the rifle with another scope and if it shoots right in the same manner I'd then look at the barrel to receiver alignment. Might need to true the front of the receiver and/or the check the barrel where it fits into the receive for squareness. Just a guess or two....


Great idea.


thank you!
 
Your scope isn't perfectly level to your rifle is my guess. I used to have this happen until I got the Wheeler scope mounting system with the leveling device for the barrel.
 
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Originally Posted By: rudymontanaYour scope isn't perfectly level to your rifle is my guess. I used to have this happen until I got the Wheeler scope mounting system with the leveling device for the barrel.

Scopes are not "level" to the rifle. If they were, the bullet trajectory would never cross the line of sight. Scopes are canted down some amount, like a 20 moa rail.
 
Originally Posted By: 6724Originally Posted By: rudymontanaYour scope isn't perfectly level to your rifle is my guess. I used to have this happen until I got the Wheeler scope mounting system with the leveling device for the barrel.

Scopes are not "level" to the rifle. If they were, the bullet trajectory would never cross the line of sight. Scopes are canted down some amount, like a 20 moa rail.

explain how a scope is canted down some amount.
 
You guys are talking about 2 different things. Rudy is talking about the reticle being square to the bore, or the vertical crosshare being truly vertical and not canted in the rings. This could be the cause with a regular scope, but there is no chance for that with an eliminator as it's got a fixed rail on the bottom used to mount it. That could be the problem but it would be a defect in the scope somehow, or in the riser used to mount the scope to the rail on the rifle.

6724 is saying that the barrel is pointed "up" slightly compared to the line of sight of the optic so that they cross paths at some point down range, and are not truly parallel.

At least that how I read it lol.
 
Originally Posted By: Mr. PoppadopalisI am going to buy some new Risers and see if the fixes the problem.


I assumed it was on at 400 because it was lights out at 100...

Great in theory, but rarely works in real life. If you want to shoot 400 yards, check the point of impact at 400 yards.
 
Originally Posted By: 6724Originally Posted By: Mr. PoppadopalisI am going to buy some new Risers and see if the fixes the problem.


I assumed it was on at 400 because it was lights out at 100...

Great in theory, but rarely works in real life. If you want to shoot 400 yards, check the point of impact at 400 yards.

Exactly!
 
The barrel is not concentric with the upper, the scope is mounted on the upper. And the barrel is faced(barrel extension) to the receiver. Square up(true) the receiver and reinstall the barrel torqued correctly and see if your horizontal dispersion improves. The groups poi placement you describe seem angle related. The scope needs to be concentric to the bore. Or you will need to compensate left slightly at close range. This is assuming your barrel is truly free floated and not being "pushed" right.
 
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Originally Posted By: spotstalkshootThe barrel is not concentric with the upper, the scope is mounted on the upper. And the barrel is faced(barrel extension) to the receiver. Square up(true) the receiver and reinstall the barrel torqued correctly and see if your horizontal dispersion improves. The groups poi placement you describe seem angle related. The scope needs to be concentric to the bore. Or you will need to compensate left slightly at close range. This is assuming your barrel is truly free floated and not being "pushed" right.


Got it!

Just waiting for the weekend so I can try to get out and resight all rifles.
 
Took the Burris Eliminator 3 off the AR and changed the risers to 1/4” ( 2 separate risers)
Headed to the range, sighted in dead on at 100 and I ended up plinking 12” steel plates at 300-600 yards with a 10mph crosswind.

Very happy camper now;-)


I figure the old riser cost me 8-10 Coyotes I missed at around 400 yards throughput last season.
 


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