Two ways to do. Make up a target with graduations in inches out to 15 - 20 inches. Clamp the scope/rifle and have it on the zero inch mark on the target at 100 yds. Then wind the scope 10 minutes, see how far the scope actually moved at 100 yds. 10MOA is 10.47 inches at 100 yds. The reticle will actually move down not up.
Second way is as you said zero rifle at 100 yds, then wind up 10 MOA (40 clicks) and fire a 3 shot group and measure how far it moved.
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