On the internal adjustments of these (ANY) scopes...
The maximum elevation is only available IF the windage is perfectly centered... and visa-versa.
Crank the elevation down til it stops, then try moving the windage. It will probably move a little in one direction, and not very much.
Move the windage to one side until it stops, and write down the setting, then move it to the other side, until it stops and write down the setting... split the two, and move the windage to that center setting, then crank the elevation down til it stops. From this place, count the MOA up you can get with the elevation... that will be the max.
If your scope is offset in the mounts, and requires windage to get zero'ed, then you loose out on your maximum elevation.
When I mount scopes on LR riffles, I center the scope windage first, then set the elevation to be 2 or 3 MOA off the bottom, then get the mounts centered and aligned, so when aero'ed at 100, all the elevation is "UP", and none is wasted... why pay $1,000++ for a scope with 140 MOA of elevation, and only get to use 60 or 70??
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On sticky windage (or elevation)...
The erector cell (responsible for W/E adjustments) is a cylinder that is held against the ends of the elevation and windage spindles by one or two springs.
Think of two shafts at 12 o'clock and 3 o'clock, with a spring at 7:30 oclock pushing the cylinder against the two shafts. There is heavy grease applied there, plus the normal resistance. It you turn the knobs "IN", the cell must move by force of the spindle, but if you turn the knobs "OUT" it is only the spring that pushes the cell to follow the shaft.
If there is any friction, or the grease is cold and thick, or the springs aren't really up to it, the cell can stick in place, and not follow the spindle face... so you crank in some "UP", or some "Right", and the cell doesn't move, until the gun is shot... the recoil jolts the gun, and the cell snaps into place.
If you have this problem, you can either send it back, describe the problem, and ask that it be cleaned and re-lubed, or you can tap the scope with a wooden stick to make sure that the cell is where it needs to be.
Many shooters move the knob way past the desired setting, and then go back to it, so the last "adjustment" was a push against the cell.
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CatShooter.