Rifle Scopes Pros and cons when using rails (or mounts) with tilt

There are the same amount of total "clicks", it just moves your zero down to make more of them available to dial up. The cons are you can go too far and move the zero beyond your scopes range of adjustment.

When you move out of the optics center you can also see a degradation in image quality.

Pretty much 99% of the time a 20 moa rail on a precision rifle will be just fine.

Zero stop has zero to do with anything other than stopping you at your zero.
 
No cons if your scope has enough internal elevation. with a 20 MOA base a scope with 60+ moa of elevation should have no issues.

If you have a zero stop then zero at 100 yards and everywhere from 10 yards to 1000 will be dialing up so no need to worry about going below the zero stop.
 
I'm clearly stupid, so explain it to me as if I was a kid ?

If I have a scope and it has 60 clicks (random #) and I use a rail that tilt 40 clicks and I zero it a 100 yards, how did i change anything? The scope still only have 60 clicks and I still zero at 100 yards?

I'm sure you're right and I'm wrong, but I cant wrap my brain around it :) ?
 
Not talking clicks but moa or mils for the first thing.

So you have 60 moa. On a flat base it's 30 up and 30 down. On a 20 moa base it redistributes the internal so now you have 50 up and 10 down so more usable elevation for long range shooting.
 
I'm clearly stupid, so explain it to me as if I was a kid ?

If I have a scope and it has 60 clicks (random #) and I use a rail that tilt 40 clicks and I zero it a 100 yards, how did i change anything? The scope still only have 60 clicks and I still zero at 100 yards?

I'm sure you're right and I'm wrong, but I cant wrap my brain around it :) ?
Say your scope has a total adjustment range of 60 MOA/clicks (calling it MOA in this case, but the units here don't matter), 30 up and 30 down from optical center.

If you put it on a 0 MOA rail, the scope will be zeroed near the optical center since the rail is not tilted any. You will still be able to adjust the scope about 30 MOA up and 30 MOA down from your 100 yard zero. This means you only have 30 MOA of "usable" elevation adjustment, because the 30 MOA down is useless to you (nobody is going to want to shoot that far below their crosshairs ever).

If you put the scope on a 20 MOA rail, your 100 yard zero will shift 20 MOA away from the optical center of the scope's adjustment range. You now have 50 MOA up and 10 MOA down to adjust. This is much better, because you want more of your adjustment range in the up direction where you'll actually use it.

You are confused because you think the scope always can adjust 30 MOA up and 30 MOA down from wherever you set your zero. This is not the case. You have a total range of 60 MOA, and your zero stop will fall somewhere within that 60 MOA range. It could be 2 MOA from the bottom of the range, 20 MOA from the bottom, 30, or even 55 MOA from the bottom of the range. The scope cannot exceed that total range of 60 MOA though, regardless of where your zero stop is set within the total adjustment range.
 
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Follow up question: Wouldn't one most often like to have the rifle zeroed at a 100 and have 90% of available mil / moa clicks for more range? I can't seem to see when i would want a bolt rifle with the ability to click 30 moa "backwards"?