I have only tested one of the March scopes but found that for the first 10moa of up the clicks were correct but from 10-20 they increased slightly in value per click.
For the test the rifle was clamped down on a concrete bench on a calibrated 100 yard range aimed at a test pattern with graduation marks. Elevation was then dialed in while watching the reticle against the test pattern.
I didn't contact Stuart about it because it wasn't a big issue for me once I established the actual click values.
I should also mention that the scope is 100% consistent and repeatable so that while the clicks might not be exactly .25 MOA per click they never changed from what they actually were.
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