Is this 1 MOA?

[J]

Your numbers look about right to me. Can't tell for sure without calipers or some sort of measuring.

Given that your horizontal extremes are also the vertical extremes it might be just slightly over. Even if your windage and elevation spreads are independently under 1 moa, the group may not be under one moa when measured correctly.

Measure center to center of the two furthest holes to confirm. Or outside to outside and subtract your caliber.