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Not enough scope adjustment

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head hunter View Drop Down
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    Posted: January/21/2010 at 05:44
A buddy of mine said his scope is adjusted down as far as it will go but his rifle is hitting six inches high at a hundered yards. Will a set of lower mounts fix his problem or does the scope need to go up?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kickboxer Quote  Post ReplyReply Direct Link To This Post Posted: January/21/2010 at 05:50
There is a lot of excluded information required to make such an analysis:
 
what kind/model of scope, how much available adjustment
what kind of rifle/mounts
what kind of rings
 
 
Opinion,untempered by fact,is ignorance.

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head hunter View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote head hunter Quote  Post ReplyReply Direct Link To This Post Posted: January/21/2010 at 06:07
It is a savage rifle with leupold rings and a leupold rifleman scope. He said the scope was about 3/8 to 1/2 inches above the barrel.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote John Barsness Quote  Post ReplyReply Direct Link To This Post Posted: January/21/2010 at 07:59
It doesn't have anything to do with the height of the scope mounts.
 
His scope is mounted "crookedly," for lack of a better word: It isn't lined up wioth the barrel very well. It needs to be remounted so that the reticle points close to the center-line of the bore before any adjustment is made.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote biggreen747 Quote  Post ReplyReply Direct Link To This Post Posted: January/21/2010 at 09:45
Originally posted by head hunter head hunter wrote:

A buddy of mine said his scope is adjusted down as far as it will go but his rifle is hitting six inches high at a hundered yards. Will a set of lower mounts fix his problem or does the scope need to go up?

The back needs to go down and the front needs to go up. There are two fairly simple ways to fix your problem. The first would be to either shim existing bases or change to a "slanted" base. The second and in my view the easiest is with Burris Signature rings. Because he is 6" (6MOA)) high at 100 yds I would use a +/-20 Insert in the rear with the thin side on the bottom and 0 inserts in the front. This should put him much closer to the center of his adjustment range. At this point I like to center the scope, in other words go all the way in one direction with the adjustments then count the number of clicks going all the way the other way. Then go half that number back. Do that with both windage and elevation. Tighten the rings just enough so the scope doesn't move and head to the range. 

If it is a bolt rifle pull the bolt and set up a 25 yard target. Visually boresight the rifle and scope. if it is centered horizontally and the reticle is 1-2in high you are done. If not start experimenting with offset inserts in the front as well. These can be rotated to any position to center and raise/lower the reticle. Use whatever combitation works (just remember a +10 and -10 etc.. must go together in the same ring) to get it horizontally centered with the barrel on the bullseye and the reticle 1-2in above the bulls eye (the height of the center of the scope above the barrel). Tighten everything down and take a few shots. I like to make sure I am centered horizontally and hitting about 1 in low at 25 yds., then move out to 100 to finish sighting in your rifle.

 I am assuming since you said Rifleman bases they are of the Weaver style. The Burris Signature Zee rings will fit those bases, you will also have to order an insert kit. I have two rifles that have this same issue and I have found this to be the easiest and best fix.


Edited by biggreen747 - January/21/2010 at 10:13
We measure it with a micrometer, mark it with a crayon, and cut it with a chainsaw.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AstroVic Quote  Post ReplyReply Direct Link To This Post Posted: January/21/2010 at 16:24
I had the same problem with my Savage Model 11 .308, except mine was about 8" high even at the farther elevation adjustment.  Turns out, the store that mounted the scope used the wrong front scope base.  They used the one for the older Savage rifles (pre-AccuTrigger versions) and mine is a newer one.
 
I wasted about $100 worth of ammo trying to figure out WTF was wrong.  I was PISSED!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote head hunter Quote  Post ReplyReply Direct Link To This Post Posted: January/21/2010 at 17:14

I will pass on this info to him. Thanks guys.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote RONK Quote  Post ReplyReply Direct Link To This Post Posted: January/21/2010 at 18:21
Originally posted by biggreen747 biggreen747 wrote:

Originally posted by head hunter head hunter wrote:

A buddy of mine said his scope is adjusted down as far as it will go but his rifle is hitting six inches high at a hundered yards. Will a set of lower mounts fix his problem or does the scope need to go up?

The back needs to go down and the front needs to go up. There are two fairly simple ways to fix your problem. The first would be to either shim existing bases or change to a "slanted" base. The second and in my view the easiest is with Burris Signature rings. Because he is 6" (6MOA)) high at 100 yds I would use a +/-20 Insert in the rear with the thin side on the bottom and 0 inserts in the front. This should put him much closer to the center of his adjustment range. At this point I like to center the scope, in other words go all the way in one direction with the adjustments then count the number of clicks going all the way the other way. Then go half that number back. Do that with both windage and elevation. Tighten the rings just enough so the scope doesn't move and head to the range. 

If it is a bolt rifle pull the bolt and set up a 25 yard target. Visually boresight the rifle and scope. if it is centered horizontally and the reticle is 1-2in high you are done. If not start experimenting with offset inserts in the front as well. These can be rotated to any position to center and raise/lower the reticle. Use whatever combitation works (just remember a +10 and -10 etc.. must go together in the same ring) to get it horizontally centered with the barrel on the bullseye and the reticle 1-2in above the bulls eye (the height of the center of the scope above the barrel). Tighten everything down and take a few shots. I like to make sure I am centered horizontally and hitting about 1 in low at 25 yds., then move out to 100 to finish sighting in your rifle.

 I am assuming since you said Rifleman bases they are of the Weaver style. The Burris Signature Zee rings will fit those bases, you will also have to order an insert kit. I have two rifles that have this same issue and I have found this to be the easiest and best fix.
 He said the scope was a Leupold Rifleman; no real description of the rings was given.
 Other than that your advice is great, Biggreen747.
 
 Burris makes the Signature System for "Weaver" style and the common Leupold "rotary dovetail" system, among others.
It works very well for solving these types of problems.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote biggreen747 Quote  Post ReplyReply Direct Link To This Post Posted: January/21/2010 at 22:56
I see that now - I miss-read that as Rifleman Bases. I'll try not to give bad advice but I know I can count on you guys to keep me straight...

Edited by biggreen747 - January/21/2010 at 23:04
We measure it with a micrometer, mark it with a crayon, and cut it with a chainsaw.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RONK Quote  Post ReplyReply Direct Link To This Post Posted: January/24/2010 at 12:44

 Always a lot of fine points in these discussions; easy to overlook something no matter how hard we try to get it all.

We all watch each others' backs around here pretty well, though!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dale Clifford Quote  Post ReplyReply Direct Link To This Post Posted: January/25/2010 at 09:17
I'm voting wrong bases.
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