It's more of a challenge to get the Master rating (Sub MOA) but yeah I hear ya, probably wouldn't take you many more tries.
Member - 3 out of 5 shots inside or touching the 4 MOA ring
Marksman - all 5 shots inside or touching the 4 MOA ring, and the group is 3 MOA or smaller measured Center to Center.
Sharpshooter - all 5 shots inside or touching the 4 MOA ring, and the group is 2 MOA or smaller C-T-C.
Expert - all 5 shots inside or touching the 3 MOA ring(9 ring), and the group is 1.5 MOA or smaller C-T-C.
Master - all 5 shots inside or touching the 2 MOA ring, and the group is 1 MOA or smaller C-T-C. (2 MOA ring on the target is required.)