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Bushnell Elite 4200 & Larue SPR-1.5 mount

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/09/2007 at 14:40
rca256 View Drop Down
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First time poster, sorry if the newbie shows. After not getting an email reply from SWFA after almost a week, I thought that I would
post my question here.

I bought a Bushnell Elite 4200 6-24x40 w/ side parallax turret to mount on my Bushmaster 24" Varminter. This rifle has previously
shot 0.75" groups at 100 meters with a Barska Huntsman 3-12 w/ weaver rings, so the rifle is not the issue with the following.

I got a Larue SPR-1.5 mount for the Bushnell and this combination shoots about 7" above the point of aim at 100 meters with the
elevation turned all the way to the bottom. It's either a problem with the mount or the scope. I don't see how one can shim a Larue
SPR-1.5 mount so I am focusing on the scope at the moment. Per the Bushnell web site specs, this particular scope should have 40
MOA adjustment but I found that mine only has 33 MOA in elevation (eight clicks per MOA on this scope.) So I am suspecting the
optics over a CRC machined mount that everyone raves about.

Am I missing something here? Thanks.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/09/2007 at 15:29
RONK View Drop Down
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  Can you put the Weaver rings back on, and put the 4200 in them?  A bit of a hassle, but it would narrow down the culprit. Even if you had the full 40 m.o.a. advertised by Bushnell, you would be zeroed up with absolutely no down elevation left over. That really isn't cool. I suspect the mount myself...

Edited by RONK
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/09/2007 at 17:05
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I agree! Highly likely, your mounts are the problem.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/09/2007 at 19:17
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 By the way, this doesn't mean that the SPR mount is necessarily "bad".  It simply means that your particular reciever, barrel, scope,mount and perhaps even ammo just don't make up one big happy family.  The mount is probably the one thing that can be shimmed or whatever to make the whole rig come together. What I am trying to say is that unless your SPR mount is somehow damaged, replacing it with a brand new one probably would not solve your problem, whereas mounting the same SPR on a different rig might work fine. I know that may sound contradictory to my earlier post, but it really isn't if you read between the lines.  Sorry I'm not more articulate today... 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/15/2007 at 23:13
rca256 View Drop Down
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I took the weaver rings off of the Barska and put them onto the Bushnell Elite 4200 6-24X40 and took it to the range today.

I successfully zeroed the Bushnell Elite 4200 at 25-yards and then moved out to 100-yards and re-shot. I had the same
problems as before. The first round was about eight inches above the point-of-aim so I adjusted the elevation turret down until
I quickly hit the bottom of the elevation limit. After that I shot a group of three rounds and the center of the group was once
again about seven inches above the point-of-aim, this being after I adjusted the elevation down as far as it would travel.

Is it common for a new scope to be "broken" like this? This sucks...    
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/16/2007 at 05:28
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rca256.....................When you had success at 25 yards and before your 1st shot at 100 yards, did you touch the turrets at all?? If not, then your problem now COULD BE with the scope recticle. How can you be dead on at 25 yards, yet be 8" high at 100? Your not shooting prone from the ground causing an upward angle in bullet flight are you? Target the same height as your shooting bench?..........I own an Elite 4200 3X9 and I have never had a problem whatsoever, sighting in or otherwise. Very unusual for this scope to have problems, however not impossible, as all things man made can go defective!............Start from scratch & bore sight the scope. Make sure your mounts and rings are tight. Shoot first at a 25 yard range. Do this for 3 rounds. Repeat process 2 more times. You want 3 groups, 3 shots each. The point here is that, you want to see consistency from all 3 groups BEFORE you try at 100 yards.......Make sure you clean your barrel after every 3rd round or after each group. Wait about 3 minutes between shots to allow the barrel to cool down as well..........By following the above, you are going through,,, a process of elimination!!.....If your 3 groups stay consistent & group well at 25 yards, then highly unlikely it`s the scope!.....If your rifle shoots 9 rounds-3 groups consistently well at 25 yards, it suddenly won`t change its mind and shoot lousy at 100. It won`t know the difference..........Try that process first before we blame the scope.....
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/16/2007 at 06:04
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Originally posted by rca256 rca256 wrote:

First time poster, sorry if the newbie shows. After not getting an email reply from SWFA after almost a week, I thought that I would
post my question here.

 

Did you ever try calling them??

 

SWFA is the biggest optics vender in the world, my friend. I can't imagine the tons of emails they get every day.

SWFA is VERY available by phone.... 

 

Welcome to The OT!!

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/16/2007 at 12:36
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Originally posted by Big Squeeze Big Squeeze wrote:

rca256.....................When you had success at 25 yards and before your 1st shot at 100 yards, did you touch
the turrets at all?? If not, then your problem now COULD BE with the scope recticle. How can you be dead on at 25 yards, yet be 8"
high at 100? Your not shooting prone from the ground causing an upward angle in bullet flight are you? Target the same height as
your shooting bench?..........I own an Elite 4200 3X9 and I have never had a problem whatsoever, sighting in or otherwise. Very
unusual for this scope to have problems, however not impossible, as all things man made can go defective!............Start from scratch
& bore sight the scope. Make sure your mounts and rings are tight. Shoot first at a 25 yard range. Do this for 3 rounds. Repeat
process 2 more times. You want 3 groups, 3 shots each. The point here is that, you want to see consistency from all 3 groups
BEFORE you try at 100 yards.......Make sure you clean your barrel after every 3rd round or after each group. Wait about 3 minutes
between shots to allow the barrel to cool down as well..........By following the above, you are going through,,, a process of
elimination!!.....If your 3 groups stay consistent & group well at 25 yards, then highly unlikely it`s the scope!.....If your rifle shoots 9
rounds-3 groups consistently well at 25 yards, it suddenly won`t change its mind and shoot lousy at 100. It won`t know the
difference..........Try that process first before we blame the scope.....


You amaze me. I might be new posting here, but I've been around AR15s for more than twenty years. Let's start...

I did not touch the turret after firing a three round group at 25-yards and going out to 100-yards. Yes, I shot from a bench. Do you know about the ballistic arc of the M193
round? Go look at http://www.ak-47.net/ammo/ss109.txt as well as sources at www.ar15.com

The M193 round climbs for a bit in a 20-inch barrel at 100 meters. Of course I'm using a 24-inch barrel and a 100-meter zero is only the start; I really want a 200-meter zero.

I replaced my rings so as to eliminate that option.

Cooling the barrel? It took a few minutes on the range to clear the line and then move the target board out to 100-yards so the barrel cooled.

I've been f*&^-ing around with this scope off and on for half a year. I did perform a process of elimination and I closed the book on it yesterday.

The Larue SPR-1.5 mount was used; the weaver ring mount was used; no difference. A Barska Huntsman 3-12 scope was used successfully. I have shot match rounds and Black
Hills Blue Box 55 grain FMJ; only the group size is affected, NOT the location of the center of the group.

It's the f*&^ing scope. It looks like I will return it to Bushnell for warranty replacement as SWFA considers any scope that has been put into rings to be used, etc.

Edited by rca256
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/16/2007 at 12:48
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Ok rca, lighten up a little.....

Please.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/16/2007 at 13:29
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rca...........Why would you be amazed???? I didn`t know that you have been around AR15`s for more than 20 years! Right? How would I know that? For all I know, this could have been a new rifle & scope for you!!!!....The questions I asked, as well as the elimination process I suggested, were not designed to suggest any stupidity or lack of thought on your part. My contention was to help you, not to demean you in any way!!! Problem solving for the most part means, getting back to the basics & starting there. My suggestions mentioned, were not previously brought up in the other postings.........I can understand your frustration for the past half year. However, when someone tries to help you by suggesting even the most basic things, not knowing your expertise, try to understand & perhaps re-adjust your attitude a little.........Just a suggestion!..................I hope that your problem is solved soon!   
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/16/2007 at 18:08
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 I think I know what's going on here, (besides a bit of an attitude problem toward those trying to help). Your scope has a "bias" in elevation. What this means is that it may have a full adjustment range, and track correctly and everything else, BUT the internal optical elements are not aligned axially to the tube which houses them.

  Leave the 4200 in the Weaver rings for the time being. You are currently out of "down" elevation, but still 7 inches high @ 100 yards. Now turn the elevation dial UP 30 minutes ( 240 Clicks), and fire a three-shot group on a big target. Your group is now centered 37 inches high at 100 yards, isn't it?

 Now if you tell Big Squeeze you're sorry, I'll tell you how to fix it.  

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/15/2010 at 16:04
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Originally posted by RONK RONK wrote:

 I think I know what's going on here, (besides a bit of an attitude problem toward those trying to help). Your scope has a "bias" in elevation. What this means is that it may have a full adjustment range, and track correctly and everything else, BUT the internal optical elements are not aligned axially to the tube which houses them.

  Leave the 4200 in the Weaver rings for the time being. You are currently out of "down" elevation, but still 7 inches high @ 100 yards. Now turn the elevation dial UP 30 minutes ( 240 Clicks), and fire a three-shot group on a big target. Your group is now centered 37 inches high at 100 yards, isn't it?

 Now if you tell Big Squeeze you're sorry, I'll tell you how to fix it.  

 
Hello.  I am a New member and came across this site by a Google search when I found this topic.
 
I have the same issue with a Leupold Vari-X II 3-9 power.  It is in a LaRue SPR 1.5 mount.
 
I have always used it on a Colt rifle with a 16" 1:9 barrel and it has always been just fine.
 
This weekend I tried to zero the scope on a Bushmaster with Saber 16" 1:7 midlength barrel.  I literally took the optic off the Colt, put it on the Bushmaster and attempted to zero at 50 yards (using a 50/200 yard zero).  The horizontal was dead centered with no adjustments.  But vertically I was off the paper and high.  I took the vertical adjustment a full rotation (10 MOA) and was still about 6" high at 50 yards.  The scope was bottomed out and would not adjust any lower.
 
Is there a solution to this problem?  If so, I'd love to hear it and I guarantee no attitude problem.  Smile
 
Thank you and I really enjoy finding this forum.
 
Corey
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