Leupold Mark 4 usable travel adjustment question

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AR-15 Gunman

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Hi. I have a leupold mark 4 with 65 MOA total adjustment. 32.5 moa each way. I have heard that the last 10% of the adjustment is the most unreliable. That puts me at 26 MOA up or down accounting for the unusable extreme 10%. Any truth to this from experience?

I would like to zero at 100 M and dial out to 800 M. I would need a 20 MOA rail to do this if the above is true.

Without the above 20 MOA rail I would need to use a 300M zero which I do not want to do.

If the the last 10% of travel statement is not true then I would be able to zero at 100M and getting out to 800M would be no problem as that literally maxes me out. 32.6 moa to get there.

Thoughts?
 
I’m not sure if you have already tried this unsuccessfully or are making an assumption that you will run out of elevation for certain?

I can tell you that I ran a Mk4 on a zero MOA base, zeroed at 100 and dialed 36 plus MOA for 1000 yards with no problems. I also run an S&B PMII on a 30 MOA base and am able to get both a 100m zero and dial out to 1000 with no issues. I supposed it’s possible to get some weird combination of base and receiver dimensions that end up using a ton of available elevation in a particular optic but that hasn’t been my experience yet.

You can’t presume that your rifle will zero with the optic precisely half way through it’s available travel. But the 20 MOA rail is pretty standard today so pick one up and be sure. I am sure you will still be able to achieve a 100 yard/metre zero with a 20 MOA rail.
 
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njohnson said:
I’m not sure if you have already tried this unsuccessfully or are making an assumption that you will run out of elevation for certain?

I can tell you that I ran a Mk4 on a zero MOA base, zeroed at 100 and dialed 36 plus MOA for 1000 yards with no problems. I also run an S&B PMII on a 30 MOA base and am able to get both a 100m zero and dial out to 1000 with no issues. I supposed it’s possible to get some weird combination of base and receiver dimensions that end up using a ton of available elevation in a particular optic but that hasn’t been my experience yet.

You can’t presume that your rifle will zero with the optic precisely half way through it’s available travel. But the 20 MOA rail is pretty standard today so pick one up and be sure. I am sure you will still be able to achieve a 100 yard/metre zero with a 20 MOA rail.
Click to expand...

Thanks for that.
I ran all the ballistic data into my calculator and with a 100 M zero I would use all my available elevation to get me to 800 M. That was assuming I start exactly in the centre of my scopes travel. Probably not the case. 20 MOA base seems to be the way to go.
 
AR-15 Gunman said:
Thanks for that.
I ran all the ballistic data into my calculator and with a 100 M zero I would use all my available elevation to get me to 800 M. That was assuming I start exactly in the centre of my scopes travel. Probably not the case. 20 MOA base seems to be the way to go.
Click to expand...

What are you shooting a 30/30? Seems like an awfully slow projectile to only be getting to 800. I still have 3 revolutions (45 moa?) on my mk4 with a 20 MOA base when shooting at 700 *edit - with my 308*
 
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