Calguns.net  

Home My iTrader Join the NRA Donate to CGSSA Sponsors CGN Google Search
CA Semiauto Ban(AW)ID Flowchart CA Handgun Ban ID Flowchart CA Shotgun Ban ID Flowchart
Go Back   Calguns.net > FIREARMS DISCUSSIONS > Rimfire Firearms
Register FAQ Members List Calendar Mark Forums Read

Rimfire Firearms .22, .17 and other Rimfire Handguns and Rifles

Reply
 
Thread Tools Display Modes
  #1  
Old 10-10-2012, 1:10 PM
Izzy43's Avatar
Izzy43 Izzy43 is offline
CGSSA Rimfire Coordinator
 
Join Date: Dec 2009
Location: Idyllwild, Ca (in the snow)
Posts: 2,656
iTrader: 9 / 100%
Default How to Determine Scope Ring Height

I have seen quite a few questions on the subject of how to determine ring size for scope mounting so thought I'd share this easy method. Its just arithmetic, not calculus. Hope this helps someone.

1. Measure outside diameter of the front Objective.
2. Divide the measurement by 2.
3. For a 1 diameter tube subtract 1/2
4. Add 1/8 for barrel clearance, 1/4 if you will install lens covers.
5. You now have the height that you need from the top of the scope mount or dovetail to the saddle of the rings.
6. Most if not all scope ring manufacturers provide these dimensions on their WebSite.

Example for 1 scope tube:

1. Front Objective outside diameter = 2.0
2. Divide by 2 = 1.0
3. Subtract 1/2 = 1/2
4. Add 1/8 for barrel clearance = 5/8 (Height of rings from top of scope mount or dovetail to the saddle of the rings.)

4a. Add 1/4 for barrel clearance and lens cover = 3/4 (Height of rings from top of scope mount or dovetail to the saddle of the rings.)

5. If a Weaver/Pictanny type scope rail is used, measure the height of the rail above the barrel and subtract that from the scope ring height determined in step 4 or 4a.

For scopes that have different size tubes such as 30mm, measure the tube diameter in inches and divide by 2. Substitute that value for the value in step 3 of the example.

A final note. For some scopes the size of the Ocular (rear eye piece) can interfere with the cycling of the bolt on some bolt action rifles. CZ rifles have a fairly high bolt throw so beware of this issue on a scope that has a large Ocular.
Reply With Quote
  #2  
Old 10-10-2012, 1:51 PM
roushstage2's Avatar
roushstage2 roushstage2 is offline
Veteran Member
 
Join Date: Aug 2011
Location: Amador County
Posts: 2,837
iTrader: 12 / 100%
Default

Very informative!
__________________
Reply With Quote
Reply

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 -8. The time now is 3:31 AM.




Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Proudly hosted by GeoVario the Premier 2A host.
Calguns.net, the 'Calguns' name and all associated variants and logos are ® Trademark and © Copyright 2002-2016, Calguns.net an Incorporated Company All Rights Reserved.