Keep in mind that at 1000 yards, the LR target's 10" X-ring is about 1 MOA, the 10-ring 2 MOA, and the 9-ring 3 MOA. You'll have to center 20 shots inside that 3 MOA to earn a decent score.  If practicing at 100 yards, the MR-31 target will give a fair approximation of scoring on the LR at 1000. Practice at 100 in some wind with a good .22 to refine the wind-doping skills essential at long-range.