Accurately working out the scope Mount height required ACCURATELY

Hi Guys.

You can use what you buddy does or a recommendation from hers (normally pretty good )

Or you can take a few measurements and find out the EXACT minimum mount height for your rifle.

Click either of the links.

The firs link is the basic first check. This gives you the minimum height for the settings YOU enter and it’s simple.

the result will ensure the mounts/scope will sit on your rifle Without touching - Unless you have a moa/mil rail. If you do, just click on the second link add the info.

The result will always be as good as your measurements - remember measure twice

fred
https://www.scopedout.com.au/ring-height-calculator/ . NEW LINK -it should now work for you

Links not working here. 404 error

Same here @Whinger, Something strange going on with the site but found out if you put the home domain address https://mil-rad.com in the search field you get a page with a link to the two pages shown by the original poster. Those work, well they did for me. Hope that helps

Yep - dead link

jesim1 said:

Yep - dead link

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Use https://mil-rad.com and go from there. Not sure why the direct link fails but suggests website index file is invalid.

The scope height calculation isn't telling you anything you can't easily work out yourself and the minimum ring height is often not always what you want to know. To make best use of airgun trajectories, line of sight relative to barrel is what I'm trying to set up. If the stock isn't adjustable the critical variable is sightline relative to the cheek piece.

If I was nit picking I'd also mention most ring heights are quoted to bottom of the clamp, not top of the rail, so take care you don't use the guide only to find you rings are a couple of mm too low.

Brian Samson did one to work out height for chairgun.

BallisticBill said:

The scope height calculation isn't telling you anything you can't easily work out yourself and the minimum ring height is often not always what you want to know. To make best use of airgun trajectories, line of sight relative to barrel is what I'm trying to set up. If the stock isn't adjustable the critical variable is sightline relative to the cheek piece.

If I was nit picking I'd also mention most ring heights are quoted to bottom of the clamp, not top of the rail, so take care you don't use the guide only to find you rings are a couple of mm too low.

Click to expand...

^^^ This

People are often misinformed that having the scope closes to the barrel is best all the time, I'd disagree, and put comfort and eye position in it's place every time.

For BR shooting your at a fixed distance, so scope height is not an issue, nor is it for FT where your "dialling in" the distance and a higher mount is advantageous for comfort and shooting position. HFT guys are probably wanting it a bit tighter, as are hunters, and the guys down the range will generally not notice an extra 1/2 inch +/- (ooh err missus )

So don't be sheep, do what suits you and your shooting

The Leupold mounted on my Steyr is 8cm from Objective centre to barrel centre and is perfect height for me when I sight the scope. Thought it was a lot at first but seems its ok.

Bighit said:

Brian Samson did one to work out height for chairgun.

Chairgun and “Scope Height”

I hear a lot of people complaining about the ballistic software Chairgun not being in line with their real world results. But in my field target rifle and scope combo’s it has improved to bei…

airgunaccuracy.wordpress.com

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It's one way but you still need to zero your scope first. If you don't and the scope is optically centred the answer will be the same as measuring at the scope.

There's an easier way than faffing around with tinfoil and shooting.
For example, with .177 your line of sight is going to cross the barrel axis at 10m.
Say your scope height at breech is 50mm
If your barrel is 500mm long thats 1/20th of the distance from gun to the 10m crossover.
So the reduction in scope height is 1/20th of 50mm = 2.5mm
Correct scope height is 47.5mm

Simple answer is take 1mm off for a really short barrel (Leshiy), 2mm for a carbine, 3mm for a long barrel

If you want to be more precise but don't know where the barrel axis/LOS crossover is, put the measured height at scope and the in Chairgun (or other ballisics app), see what distance Chairgun says the crossover is, then use that to calculate the adjustment, There will be a small but insignificant error. In my example it would be 1/20 x 2.5mm = 0.13mm.

I don't think you'll be measuring holes in paper to anything like that level of precision. And just to head off anyone who says, "What about muzzle flip?" I'm talking sub-12 air rifles not elephant guns. If your springer is flipping at the muzzle by more than a fractions of a mm (it would equate to 20x that at 10m) then you need to get your springer tuned.

Eye alignment when your in YOUR shooting position is what matters. You shouldnt have to move your head about to get in position for your scope height.

Sorry Guys, I tried it before posting, I’ll have a look around

fred

This one is working for me:


Sadly I can’t find a replacement option for the rail cant

Sometimes the mag will play a factor as I've found out on both the TDR and the Regal. The Steyer is not a problem. As has been mentioned above, comfort plays a major part.

Just remember, high profile, is for 50 - 56 mm
Medium profile fits 40 - 44 mm
Low profile fits 32
And you should, try and get, the front of the scope, as close to the barrel, as possible

keithy said:

Eye alignment when your in YOUR shooting position is what matters. You shouldnt have to move your head about to get in position for your scope height.

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Absolutely correct.
The only thing that should determine scope height, is correct head position.

Trajectory can be altered by choosing the right zero distance

+ what others have said about comfort when in a shooting position. I mount the rifle with my eyes closed & then when I open both eyes I want a clear and centered scope sight picture. With a 44 mm objective Hawke scope mounted with Hawke tactical 2 piece medium rings the center line was 1.5" above the bore. I had to add a leather cheek piece to get this scope alignment. This site has a lot of excellent scope info.
https://www.rimfirecentral.com/thre...ounts-super-sticky-questions-try-here.496141/
44 mm scope with medium rings leaves about 1/8" objective clearance.

Hawke 2 piece medium ring dimensions.

Sniper Al said:

Just remember, high profile, is for 50 - 56 mm
Medium profile fits 40 - 44 mm
Low profile fits 32
And you should, try and get, the front of the scope, as close to the barrel, as possible

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The last part about close to barrel is not exactly true. I shoot HFT with high mounts and 32mm objective scope this makes the far shots, which are harder to range, a tad easier. As closes up the holdover.

Always try to keep scope as close to barrel as possible, so different mounts for different object lens also pcp to springers cylinder and blocks cause a whole new ball game

I was able to use medium rings to mount a 50 mm scope on my M70 30-06 due to the shape/design of the receiver & barrel.