Lee Delux Quick trim

[angrybear]

No I mean across the top of the neck one size could be a few thou higher than the other thanks

If Graham is correct & the sides of the case are not parallel then you cannot use a square to check the neck face for true, because the face of the neck will not be at 90* to the case side

If you put the square on the other side of the case the low point would appear to swap sides.

[Parabuteo]

Few if any rifle case walls are parallel or they would not feed/extract very well, particularly if the case was soft and not springing back as well is it might.