Shimming scope base mount. - M14 Forum

M14 Forum


Shimming scope base mount.

This is a discussion on Shimming scope base mount. within the Gunsmithing forums, part of the M14 M1A Forum category; Today I mounted a Burris scope on my Weatherby Vanguard. Took it out to sight it in and found it hitting 16" low at 20 ...


Go Back   M14 Forum > M14 M1A Forum > Gunsmithing

35Thanks
Reply
 
LinkBack Moderator Tools Display Modes

Old February 5th, 2017, 02:27 PM   #1
Rifleman
 
Join Date: Oct 2014
Location: Michigan
Posts: 61
Shimming scope base mount.

Today I mounted a Burris scope on my Weatherby Vanguard. Took it out to sight it in and found it hitting 16" low at 20 yards. No elevation adjustment left. Windage is spot on perfect. Looks like I have to shim the rear base mount. I've never done this before. Any advice to offer from the more experienced folks?

Also, in an effort to return my scope back to zero on the windage adjustment, I counted clicks from full up to full down and set it at half the value. I counted a total of 56 clicks before it got tight. I assumed there would be more total adjustment than that. The scope is a Burris fullfield II. What say the collective?
Thanks,

fastdadio is offline  
Remove Ads
Old February 5th, 2017, 02:30 PM   #2
Lifer
 
Wasted ammo's Avatar
 
Join Date: Dec 2016
Location: GA
Posts: 2,074
Something isn't right, you shouldn't have to shim the mounts. What kind of mounts and rings are you using?

Wasted ammo is online now  
Old February 5th, 2017, 02:38 PM   #3
Old Salt
 
wiz1997's Avatar
 
Join Date: Sep 2013
Location: Pearland, Texas
Posts: 1,805
Shimming is a last resort.

Check the height of the rings, I've had rings out of the same package be slightly different.

Swap the front to the back and check again.

Is the mount on correctly?

Do the rings fit properly on the mount?

Lot of things to check before shimming.

wiz1997 is offline  
 
Old February 5th, 2017, 02:48 PM   #4
Lifer
 
Capona's Avatar
 
Join Date: Jul 2013
Location: Illinois
Posts: 2,835
You got another problem if your over a foot low at 16 yards.

If you only have 56 clicks if travel, I'd say yo have a scope issue. If it's a moa scope, 56 clicks only gives you 14 moa if travel and that can't be right.

Thanks from ray55classic

Last edited by Capona; February 5th, 2017 at 04:06 PM.
Capona is online now  
Old February 5th, 2017, 02:48 PM   #5
Rifleman
 
Join Date: Oct 2014
Location: Michigan
Posts: 61
Quote:
Originally Posted by Wasted ammo View Post
Something isn't right, you shouldn't have to shim the mounts. What kind of mounts and rings are you using?
The base mounts are Warne maxima series for non-magnum actions.
The rings are Weaver grand slam steel. 1" medium.

fastdadio is offline  
Old February 5th, 2017, 02:58 PM   #6
Rifleman
 
Join Date: Oct 2014
Location: Michigan
Posts: 61
Quote:
Originally Posted by wiz1997 View Post
Shimming is a last resort.

Check the height of the rings, I've had rings out of the same package be slightly different.

Swap the front to the back and check again.

Is the mount on correctly?

Do the rings fit properly on the mount?

Lot of things to check before shimming.
Swapping the rings is a good idea, I'll try that.
The mounts and rings seem to be correct. No issues with the mounting at all and every thing went together smoothly and I thought the rings fit the mount very well and secure. I have mounted several scopes over the years and never had any problems before now.

fastdadio is offline  
Old February 5th, 2017, 03:14 PM   #7
Lifer
 
Wasted ammo's Avatar
 
Join Date: Dec 2016
Location: GA
Posts: 2,074
Make sure the lock part on those rings are turned the same way and the correct way, the part that comes off when the screw is removed. You have to look close but it only goes one way, if it's upside down will cause problems.

Wasted ammo is online now  
Old February 5th, 2017, 03:21 PM   #8
Rifleman
 
Join Date: Oct 2014
Location: Michigan
Posts: 61
Quote:
Originally Posted by Wasted ammo View Post
Make sure the lock part on those rings are turned the same way and the correct way, the part that comes off when the screw is removed. You have to look close but it only goes one way, if it's upside down will cause problems.
I'll double check when I swap the rings, but I did look close while mounting and they looked pretty obvious as to which way to lock them in. Thanks.

fastdadio is offline  
Old February 5th, 2017, 03:22 PM   #9
Lifer
 
Wasted ammo's Avatar
 
Join Date: Dec 2016
Location: GA
Posts: 2,074
Send us a pic if you can,help us help you.

Wasted ammo is online now  
Old February 5th, 2017, 03:59 PM   #10
Dodgin' The Reaper
 
ray55classic's Avatar
 
Join Date: Jan 2011
Location: east of Eden in the land of Nod on the boulevard of broken dreams
Posts: 6,495
I think you have a scope problem, you say you only have 56 clicks of total elevation with your scope.
With 1/4" clicks that's a grand total of 14 MOA , with 1/2" clicks that's 28 MOA.
The Burris Fullfield II comes in 4 flavors
[1] the 2x7 has 60moa elev adj with 1/2" clicks =120clicks
[2] the 3x9 has 50moa elev adj with 1/4" clicks = 200 clicks
[3]the 4.5x14 has 40moa elev adj with 1/4" clicks = 160 clicks
[4]the 6.5x20 has 30moa elev adj with 1/4" clicks = 120 clicks


Last edited by ray55classic; February 5th, 2017 at 04:18 PM.
ray55classic is offline  
Old February 5th, 2017, 04:06 PM   #11
Lifer
 
Wasted ammo's Avatar
 
Join Date: Dec 2016
Location: GA
Posts: 2,074
You may be on to something there Ray. I have had a lot more problems with scopes than I have rings or mounts. I try to ask questions first before saying it's probably the scope, while more times than not it is the scope.

Thanks from ray55classic
Wasted ammo is online now  
Old February 5th, 2017, 04:33 PM   #12
Grunt
 
Wjchastain's Avatar
 
Join Date: Jan 2017
Location: North Carolina
Posts: 82
Can you slip the turrets on that scope if so check to see if the turrets are bottoming out and you still have more adjustment to go.

Wjchastain is offline  
Old February 5th, 2017, 04:35 PM   #13
Rifleman
 
Join Date: Oct 2014
Location: Michigan
Posts: 61
Quote:
Originally Posted by ray55classic View Post
I think you have a scope problem, you say you only have 56 clicks of total elevation with your scope.
With 1/4" clicks that's a grand total of 14 MOA , with 1/2" clicks that's 28 MOA.
The Burris Fullfield II comes in 4 flavors
[1] the 2x7 has 60moa elev adj with 1/2" clicks =120clicks
[2] the 3x9 has 50moa elev adj with 1/4" clicks = 200 clicks
[3]the 4.5x14 has 40moa elev adj with 1/4" clicks = 160 clicks
[4]the 6.5x20 has 30moa elev adj with 1/4" clicks = 120 clicks
Great info here! Thanks. Mine is the 3x9x40mm. BDC reticle. I'm only guessing at the number of clicks. Lemme splain...I came to a hard stop while going up. The stop is definite. When counting clicks from full up to full down, I got to a point where the pressure required to turn the turret began to feel quite a bit harder and this is where I stopped not wanting to possibly damage the scope. As far as the scope being faulty? I just removed it from my M1a and it was zeroed and working fine on that rifle. But, stranger things have happened to me. So armed with the info above, I should have to go 100 clicks from full up or down to be at mid elevation? I'm going to try it again.
Thanks folks.

Thanks from ray55classic
fastdadio is offline  
Old February 5th, 2017, 04:36 PM   #14
Rifleman
 
Join Date: Oct 2014
Location: Michigan
Posts: 61
Quote:
Originally Posted by Wjchastain View Post
Can you slip the turrets on that scope if so check to see if the turrets are bottoming out and you still have more adjustment to go.
I don't know what "slip the turrets" means.

fastdadio is offline  
Old February 5th, 2017, 04:59 PM   #15
Dodgin' The Reaper
 
ray55classic's Avatar
 
Join Date: Jan 2011
Location: east of Eden in the land of Nod on the boulevard of broken dreams
Posts: 6,495
Taking your time mounting a scope will eliminate the majority of potential problems .
I'm a firm believer in lapping your rings so your certain both are perfectly aligned,
however you can still get good results just by checking the little things.
Seat the scope in the rings check carefully to see if it's fully seated in both rings & rotates easily,
now put the caps on and seat them check again.
I always snug all screws in steps first seating all of them then take all up a step equally ,
until they are all tightened to specs , It's just like putting on a head gasket.
nothing gets overtorqued that way
I can't overstress ring alignment, people spend a lot of $$$ buying a nice scope and pinch pennys aligning them .
If the rings aren't aligned you just bent the tube on that nice new High Dollar scope

Thanks from Wasted ammo
ray55classic is offline  
Reply

  M14 Forum > M14 M1A Forum > Gunsmithing

Moderator Tools
Display Modes


Similar M14 Forum Discussions
Thread Thread Starter Forum Replies Last Post
SA 4th Gen Steel Scope Mount - Range Report techvoodoo Optics 11 November 19th, 2015 09:36 PM
Good primer on scopes and pic of author w/his & our favorite rifle Deacon Optics 3 September 2nd, 2014 08:24 PM
Ewings scope mount Sailormilan2 The M14 4 August 19th, 2013 04:07 PM
NEW Bassett Picatinny Rail Scope Mount flintsghost Optics 22 January 14th, 2009 02:52 PM
Starlight scope Mount M14 base????? Les Staley Bill Ricca 6 January 16th, 2005 04:47 PM



Top Gun Sites Top Sites List