Go Back   Maryland Shooters > Topics of Interest > Gunsmithing
Don't Have An Account? Register Here

Join MD Shooters

Reply
 
Thread Tools Display Modes
Old June 8th, 2019, 08:53 AM #1
rtse4me rtse4me is offline
Member
 
Join Date: Apr 2013
Location: Howard County
Posts: 213
rtse4me rtse4me is offline
Member
 
Join Date: Apr 2013
Location: Howard County
Posts: 213
Modifying Scope base for cant

I have a couple Sako rifles with their Optilock bases and rings. I would like around 25moa of cant. I know DIP makes a 25moa picatinny rail but they use set screws to hold the rail in place. Sako's are not tapped.
So I was thinking of just shimming the rear base between the ring and base like .025".
Would this work? Seems like a easy way to get the cant I need.
Attached Images
 
rtse4me is offline   Reply With Quote
Old June 8th, 2019, 08:55 AM #2
DavidA's Avatar
DavidA DavidA is offline
The Master of Disaster
 
Join Date: Dec 2013
Location: Annapolis
Posts: 98
Send a message via Skype™ to DavidA
DavidA DavidA is offline
The Master of Disaster
DavidA's Avatar
 
Join Date: Dec 2013
Location: Annapolis
Posts: 98
Send a message via Skype™ to DavidA
Quote:
Originally Posted by rtse4me View Post
I have a couple Sako rifles with their Optilock bases and rings. I would like around 25moa of cant. I know DIP makes a 25moa picatinny rail but they use set screws to hold the rail in place. Sako's are not tapped.

So I was thinking of just shimming the rear base between the ring and base like .025".

Would this work? Seems like a easy way to get the cant I need.


Yes it will work just make sure shim set across entire contact areas. If not base can move



Sent from my iPhone using Tapatalk
DavidA is offline   Reply With Quote
Old June 8th, 2019, 09:07 AM #3
atblis atblis is offline
Senior Member
 
Join Date: May 2010
Posts: 1,115
atblis atblis is offline
Senior Member
 
Join Date: May 2010
Posts: 1,115
Depending on what you're trying to achieve, buying a scope with a larger amount of adjustment might be an option. The Sightron SIII LRs have something like 120 MOA of adjustment.
atblis is offline   Reply With Quote
Old June 8th, 2019, 09:13 AM #4
steves1911's Avatar
steves1911 steves1911 is offline
Senior Member
 
Join Date: Dec 2011
Location: On a hill in Wv
Posts: 1,481
steves1911 steves1911 is offline
Senior Member
steves1911's Avatar
 
Join Date: Dec 2011
Location: On a hill in Wv
Posts: 1,481
Burris makes scope rings that come with shims for just that.
__________________
"one day you may find me dead face first in a ditch, but by god i will be surrounded by a pile of brass"
steves1911 is offline   Reply With Quote
Old June 8th, 2019, 10:24 AM #5
bigjohn's Avatar
bigjohn bigjohn is offline
Senior Member
 
Join Date: Jun 2007
Posts: 2,318
bigjohn bigjohn is offline
Senior Member
bigjohn's Avatar
 
Join Date: Jun 2007
Posts: 2,318
Get a machinist to machine them for the cant
bigjohn is offline   Reply With Quote
Old June 8th, 2019, 06:17 PM #6
Pinecone Pinecone is offline
Senior Member
 
Join Date: Feb 2013
Posts: 18,225
Pinecone Pinecone is offline
Senior Member
 
Join Date: Feb 2013
Posts: 18,225
If you just shim one ring, with a flat shim, the inner ring surfaces with not be parallel.

You need to shim both front and rear with properly tapered shims.
Pinecone is offline   Reply With Quote
Old June 8th, 2019, 09:26 PM #7
rtse4me rtse4me is offline
Member
 
Join Date: Apr 2013
Location: Howard County
Posts: 213
rtse4me rtse4me is offline
Member
 
Join Date: Apr 2013
Location: Howard County
Posts: 213
Quote:
Originally Posted by Pinecone View Post
If you just shim one ring, with a flat shim, the inner ring surfaces with not be parallel.

You need to shim both front and rear with properly tapered shims.
Thanks,that makes sense both front and rear rings need to be canted. Figured it wouldn't be an easy fix. I do have access to a small mill but have limited experience. Will have to do some research.

The other idea I had is to get a DIP picatinny rail and replace the standard set screws with brass set screws so it wouldn't mar the receiver.
Wish some would make a rail that would tighten like the Optilock bases do
rtse4me is offline   Reply With Quote
Old June 9th, 2019, 04:23 AM #8
KRC KRC is offline
Junior Member
 
Join Date: Sep 2018
Location: Cecil County MD
Posts: 55
KRC KRC is offline
Junior Member
 
Join Date: Sep 2018
Location: Cecil County MD
Posts: 55
Shimmed Bases

I have shimmed one scope base (~.025" or .030" as I recall) and not the other with no issues with not angling the other base ("ghetto MOA bases"). It worked perfectly and enabled me to use the scope for long distance shooting.

It would be best to use a piece of properly sized round stock (Brownell's?) and lapping compound to lap both rings after shimming, but I've found this was not required, at least the time I did it. Some scope rings come with sticky fabric strips or some other material which also helps with alignment.

How much of a lift do you need?
KRC is offline   Reply With Quote
Old June 9th, 2019, 06:18 AM #9
1time 1time is offline
Senior Member
 
Join Date: Apr 2009
Location: Baltimore, Md
Posts: 1,252
1time 1time is offline
Senior Member
 
Join Date: Apr 2009
Location: Baltimore, Md
Posts: 1,252
Quote:
Originally Posted by Pinecone View Post
If you just shim one ring, with a flat shim, the inner ring surfaces with not be parallel.

You need to shim both front and rear with properly tapered shims.


Still wonít line up. The front ring needs to be lower, not just shimmed. All shimming is is tilting the rings forward. The back of the hole in the ring will be higher than the front. With shims, the back of the front ring will be higher than the front of the back ring.

OP, you have a nice set up. Donít get cheap now. Iím sure egw or the like has a canted base. You are asking for problems shimming them.
1time is offline   Reply With Quote
Old June 9th, 2019, 08:52 AM #10
rtse4me rtse4me is offline
Member
 
Join Date: Apr 2013
Location: Howard County
Posts: 213
rtse4me rtse4me is offline
Member
 
Join Date: Apr 2013
Location: Howard County
Posts: 213
Quote:
Originally Posted by 1time View Post

OP, you have a nice set up. Donít get cheap now. Iím sure egw or the like has a canted base. You are asking for problems shimming them.
DIP does make a 25MOA rail for my Sako Finnfire. I heard the set screws mar up the top of the receiver so I was trying to think of alternatives

The scope I have currently has 80moa total travel and would like 50+moa of elevation.
Attached Images
 
rtse4me is offline   Reply With Quote
Reply

  Home Page > Forum List > Topics of Interest > Gunsmithing


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 01:53 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
© 2019, Congregate Media, LP Privacy Policy Terms of Service