Scope Mounting - A Quick Mount Height Calculation
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- čas přidán 3. 12. 2020
- This is a useful method to quickly find out the scope mount height you need for your scope. Taking two quick measurements, you can work out the minimum mounting height required for your scope.
We measure the Objective Lens Outer Diameter and also the Mid Tube Diameter, then use these measurements to determine the distance between the bottom of the mid tube to the bottom of the objective lens.
The example on the video and the working out is as follows:
On a Zeiss 3-12x56 Scope
Half of the Objective Lens Diameter of 62mm = 31mm
minus
Half of the Mid Tube Diameter of 30mm = 15mm
Equals 16mm Mounting Height Required
We use this method every day to work out what height mounts customers require. Another Example would be:
Swarovski DS 5-25x52
Half of Objective Lens Diameter of 65mm = 32.5mm
minus
Half of the Mid Tube Diameter of 40mm = 20mm
Equals 12.5mm Mounting Height Required
We also look into a method to achieve a lower mounting height by looking at the drop between the action and the barrel. This varies from rifle to rifle, so we would usually ask you to measure this. Whereas it is usually around 4 or 5mm, we cannot be totally sure of this. Bearing this in mind, if your barrel drop measures 5mm and you have a Zeiss 3-12x56 with a 16mm Mounting Height, you can lower this 16mm by 5mm, resulting in a 11mm Mounting Height Required. This would be the very minimum height you would need, so it's normally a good idea to add a couple of mm to this minimum height to guarantee that you avoid any contact with the barrel. A safe height here would be 12 or 13mm of mounting height.
You can then look at various mounts, with the knowledge that your minimum mounting height needs to be at least 12 or 13mm to be safe.
ADDITION TO THE VIDEO: Although you may achieve a low scope mounting setup using the correct hardware. An extra thing to check is the bolt clearance on your scope. On some occasions you may find the bolt lift hindered by the scope's eye piece.
Plus, you may want to consider the additional height needed if you have and use a lens cap or Butler Creek on your scope. Lens caps can be 2-3mm, so if your scope is extremely low to the barrel, you won't be able to use these.
We're happy to answer any questions and if you have any, please feel free to leave a comment below.
Website: alanrhone.com
Don't forget to Subscribe to our CZcams Channel. - Sport
Thanks Dave! This was an excellent tutorial,
best video on the subject. do remember to account for the thickness of any scope lense covers you use.
Best scope mounting video ever!
Best video so far that I’ve seen on this. So simple. Thank you.
Great video. Been looking all over to figure out how to do this. Many thanks.
Good clear instructional video, I also went on your website, great range of mounts.
Many thanks
The lower the scope is great , but you have to take into consideration your comfort factor . If you are forced to get you head in an uncomfortable position on the stock you won't get the butt comfortable in your shoulder. Bad seating on your shoulder means you will notice recoil much more , plus not being able to brace your neck to your shoulder properly resulting in constantly worrying about being clouted by the scope . If you are not comfortable you won't shoot straight . I know this is all obvious but it is no good aiming for the lowest scope mount till you get the rifle comfortable on your body..
Very good point and definitely a factor to consider. Thank you
Very informative as usual, you do some great work👍
Great tutorial.
very informative,thanks so much!
Great video, thanks for the info!
That dang math everyone hates. Good work.
Best video have seen on height calculator
Wow bro you’re a genius nice videos bro
Very helpful
Another thing you have to check on some rifles like the Remington 700 is the gap between the bolt handle and the scope. I dropped my scope down as far as it could go based on those measurements and my bolt would not function. So I got taller rings .
Very good point. I can't alter the video, but I will add a point to the description. All the best!
@@alanrhonemedia nothing wrong with your video, very informative.
Thank you for your tips, the only thing I would have considered would be the added thickness of the lens caps ,
I only know since it has happened to me.
Yes, a good and valid point. I might add this to the video description to accommodate for a lens cap or Bulter Creek if you use one, as these are normally 2-3mm. Thanks for the input.
thanks for this video, super! Does this calculation also consider the downward cant of the slope when you’re dialing to maximum elevation? Eg, if a scope has 100 moa of dial-able elevation?
The method works for the scope body itself. So the scope body will not change position when you dial in any elevation within the scope, it's only the reticle inside the scope that changes.
On the other hand, if you have mounts with built in MOA, which lifts the scope at the rear and effectively lowers the objective lens towards the barrel. This may have to be taken into consideration. For instance, we supply an adjustable MOA mount which adjusts from 0-70 MOA in increments of 10 MOA. We see an Objective Lens drop of approximately 5mm on some scopes when you adjust from 0 MOA to 70 MOA.
I hope this makes sense and helps you out with your question.
Nice video. Thank you!
Glad you liked it!
So quick question,are most picatinni rails the same height or do they differ in height a lot.?.
They do vary slightly depending on manufacturer. There are rifles with different heights for the front and rear bases, so a picatinny rail will compensate for this and one side of the rail will be thicker than the other. The height is usually measured off the higher base on the rifle and we tend to say this will be between 5 and 7mm.
@@alanrhonemedia thanks for the information.
How much would a 20 moa drop a 56mm objective with a 34mm tube ? Thank you
It depends on the length of the scope really. But I would tend to suggest the drop from 20mm on a typical scope, I would allow 2 to 3mm of drop. I hope that helps.
@@alanrhonemedia yes it does , thank you 😁
🇺🇦👍
stop saying mil, the unit of measure is not mil....its meters, the measure of length in the metric system is meters, mil is just an abbreviation that means 1/1000, in this case 30 mm or 30/1000 meters, the mil is meaningless by itself as you can have millimeters, milligrams, milliradians, milliseconds, milliamps, milliliters, millivolts ...there pretty simple isn't it
Thank you for the input. We will try to use the full term "millimetres" in future to avoid any possible confusion for our viewers. We've not had anyone question which measurement type we're referring to when we use the term mil before, when the context is clearly length in this case, but there's always a first time. I'm sorry if you, or anyone else, has tried to measure the distances in milliseconds or millivolts based on us using the term mil in the video. Sorry to ramble on and keep you, I'm sure there must be someone out there using the phrase PIN Number, that I'm sure you'll feel the need to correct. Or someone not using a capital letter at the start of their sentence, that needs an unnecessarily long explanation about the importance of using correct grammar.
This might really only be of concern to that backward colony , the USA. The rest of the world uses and understands the metric system.@@alanrhonemedia
@@alanrhonemediadon’t let the slow ones get to you mate, and don’t bother changing your phrasing to suit them. Everyone knows what mill means
In your face!!!