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Why might it matter on a .50 cal?Re: Ring Height Questions
The above is taking into account the butler creek caps. The ones i have are aprox .035-.040 thick and get thinner when stretched over the scope. I have been known to sand down butler creek caps to allow the use of lowest possible rings...
Clearance is just that, it doesn't matter if you have 1/16 inch or a foot, its still clearance. On a .50 cal it might matter...
Thank you for the information!Guys,
Lately, on average of about 1 per day, I have seen quite a few posts (mostly from newbies) regarding questions about what ring height should be used. They usually request pics for comparison. For all new guys, there is a systematic way of calculating ring height that doesn't require more than a simple elementary school ruler. You measure 3 things:
1. the height of the front of your base/rail from the barrel
2. the height of your rings from the top of the rail to centerline
3. the outside diameter of the bell of the scope (not the size of the objective lens)
Here is the equation:
[rail height + ring height] - [bell diameter x 0.5]
If the value is positive, then your bell will clear the barrel. Ideally, you want that bell to be about 1/4" or less over the barrel. This will give you a tight cheek weld. Be sure to account for Butler Creek caps if you intend on using them.
If you are using a 40mm objective, then you can use the lowest rings and bases available, as the bell will certainly clear the barrel with no problem. i.e. don't worry if the bell ends up being higher than 1/4" over the barrel.
Hope this helps.
mike
Just another note. If you are using a scope base and/or mount/rings that have built in elevation, that may have to be accounted for in the case of very small clearance. To calculate this, we need to know the amount of elevation built into the mount/rings and/ or base, and the length from the end of the scope base to the end of the scope bell. Convert MOA into degrees, and then the equation is:
Tan ? x length
For example, if you are using a 20 MOA base, and the distance from the edge of the scope base to the end of the bell is 5". 20 MOA = 0.333 degrees, so:
Tan 0.333 x 5 = 0.029"
This means that you need an extra 0.029" of clearance in addition to the calculation above
-mp
Windage knob to get height above bore for ballistic program.When measuring the distance between the center of the rifle bore and the center of the scope do you measure from the back of the scope the center or front to get your distance
Thanks
I had to trim one picatinny lug’s worth of rail in order to mount 50 and even 44mm bells far enough back for proper eye relief. Thankful that i had Brownells Alumablack and Ampho Blue on hand.Re: Ring Height Questions
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Fritz24</div><div class="ubbcode-body">I have no problems with bell/barrel clearance - but as we speak am having a mounting issue where the scope's bell is making contact with the forward end of the 20MOA base(a Seekins base as it happens). I can't get the scope back far enough for proper relief without contact with low or medium rings on my 700P. (Scope is 10x40 SS)
Is it just me? </div></div>
I personally havent heard of this problem. It may come down to you needing a different mount. Maybe Glen or someone will chime in with a solution.
Guys,
Lately, on average of about 1 per day, I have seen quite a few posts (mostly from newbies) regarding questions about what ring height should be used. They usually request pics for comparison. For all new guys, there is a systematic way of calculating ring height that doesn't require more than a simple elementary school ruler. You measure 3 things:
1. the height of the front of your base/rail from the barrel
2. the height of your rings from the top of the rail to centerline
3. the outside diameter of the bell of the scope (not the size of the objective lens)
Here is the equation:
[rail height + ring height] - [bell diameter x 0.5]
If the value is positive, then your bell will clear the barrel. Ideally, you want that bell to be about 1/4" or less over the barrel. This will give you a tight cheek weld. Be sure to account for Butler Creek caps if you intend on using them.
If you are using a 40mm objective, then you can use the lowest rings and bases available, as the bell will certainly clear the barrel with no problem. i.e. don't worry if the bell ends up being higher than 1/4" over the barrel.
Hope this helps.
mike
Just another note. If you are using a scope base and/or mount/rings that have built in elevation, that may have to be accounted for in the case of very small clearance. To calculate this, we need to know the amount of elevation built into the mount/rings and/ or base, and the length from the end of the scope base to the end of the scope bell. Convert MOA into degrees, and then the equation is:
Tan (theta) x length
For example, if you are using a 20 MOA base, and the distance from the edge of the scope base to the end of the bell is 5". 20 MOA = 0.333 degrees, so:
Tan 0.333 x 5 = 0.029"
This means that you need an extra 0.029" of clearance in addition to the calculation above
-mp
Ok. Using a ring calculator, I have a 64mm outside objective diameter, 3mm for tenebraex cap, 20 MOA rail, and 0 rail to barrel clearance as the top is all rail. Using a 38 mm / 1.5 inch ring height it says I have 2.06 mm clearance. March 5x42 HighMaster 34mm scope and Cadex Covert rifle. I can get a deal on a Spuhr 4602 with 20MOA built in for a reasonable price. The example above is almost bang on that I would need .029 extra clearance which is 0.7366mm. Giving me a grand total of 1.32 mm clearance. Am I cutting it too close? Should I pull the trigger with these calculations as they are expensive rings that cant be returned. Any input appreciated. Thanks.Guys,
Lately, on average of about 1 per day, I have seen quite a few posts (mostly from newbies) regarding questions about what ring height should be used. They usually request pics for comparison. For all new guys, there is a systematic way of calculating ring height that doesn't require more than a simple elementary school ruler. You measure 3 things:
1. the height of the front of your base/rail from the barrel
2. the height of your rings from the top of the rail to centerline
3. the outside diameter of the bell of the scope (not the size of the objective lens)
Here is the equation:
[rail height + ring height] - [bell diameter x 0.5]
If the value is positive, then your bell will clear the barrel. Ideally, you want that bell to be about 1/4" or less over the barrel. This will give you a tight cheek weld. Be sure to account for Butler Creek caps if you intend on using them.
If you are using a 40mm objective, then you can use the lowest rings and bases available, as the bell will certainly clear the barrel with no problem. i.e. don't worry if the bell ends up being higher than 1/4" over the barrel.
Hope this helps.
mike
Just another note. If you are using a scope base and/or mount/rings that have built in elevation, that may have to be accounted for in the case of very small clearance. To calculate this, we need to know the amount of elevation built into the mount/rings and/ or base, and the length from the end of the scope base to the end of the scope bell. Convert MOA into degrees, and then the equation is:
Tan (theta) x length
For example, if you are using a 20 MOA base, and the distance from the edge of the scope base to the end of the bell is 5". 20 MOA = 0.333 degrees, so:
Tan 0.333 x 5 = 0.029"
This means that you need an extra 0.029" of clearance in addition to the calculation above
-mp
Ok. Using a ring calculator, I have a 64mm outside objective diameter, 3mm for tenebraex cap, 20 MOA rail, and 0 rail to barrel clearance as the top is all rail. Using a 38 mm / 1.5 inch ring height it says I have 2.06 mm clearance. March 5x42 HighMaster 34mm scope and Cadex Covert rifle. I can get a deal on a Spuhr 4602 with 20MOA built in for a reasonable price. The example above is almost bang on that I would need .029 extra clearance which is 0.7366mm. Giving me a grand total of 1.32 mm clearance. Am I cutting it too close? Should I pull the trigger with these calculations as they are expensive rings that cant be returned. Any input appreciated. Thanks.
Hi. Yes that is the rifle as I will mainly be shooting from a tripod as below ...it's a cross over gun hunting/range/SHTF . Lots of adjustments to make it fit as an extension of the body. Only concerned with it clearing the rail and the additional 20 MOA on the mount. 20-30 MOA is good for this scope as it packs a lot of magnification in a small package and you will get IQ degradation at the outer limits of the magnification range. I would want to be looking through the centre of the lens as much as possible. It may seem a bit of overkill on the magnification for this rifle and therefore the problem with 64mm outside objective diameter but I want to clearly identify game at 1000 yrds and see groupings at 500 yrds.This rifle below? It's a flat top so you will need something in the 1.5" height whether ring or mount.
View attachment 8510845