Leupold Mark 4 usable travel adjustment question

[AR-15 Gunman]

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?

 

[Alpheus]

The erector assembly in the round scope tube moves horizontally and vertically. At the very top and bottom of the vertical travel, there is a lot less horizontal travel available. This means if you had to go a few moa left or right to zero, you wont be able to use the full vertical range because you will hit the 11 or 1 o'clock because of the windage dialled in to zero.

You are also assuming you will zero at dead center of elevation and windage. You won't. Get the 20moa rail.

 

[AR-15 Gunman]

The erector assembly in the round scope tube moves horizontally and vertically. At the very top and bottom of the vertical travel, there is a lot less horizontal travel available. This means if you had to go a few moa left or right to zero, you wont be able to use the full vertical range because you will hit the 11 or 1 o'clock because of the windage dialled in to zero.

You are also assuming you will zero at dead center of elevation and windage. You won't. Get the 20moa rail.

That is good information. Thank you

 

[Seven Lakes]

There’s no downside to getting the 20 MOA rail that I can think of, especially if you’re already putting a 1 piece rail on a gun (not sure if that’s the case or if you’d otherwise just use rings and bases).

As far as the travel statement, that’s might be more an issue with lesser quality scope but all of my experiences with the Mark 4 have been such that I’ve never noticed an issue.

I’d say get the 20moa rail and call it a day.