Have you done any load development with the rifle?
I looked at a 3 Band Enfield on the Dixie Gunworks Site and they suggested 60gr. of 2F for one and 90gr of 2F for another. One reason you are shooting low could be the the load is hot, 90gr. of 3F should have faster velocities than the 2F load and faster velocities tend to have lower points of impact.
Another reason could be the weight of the Minie, a heavier bullet should raise the point of impact a bit.
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