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Are you sure you are shooting exactly from 10 yards?
The reason I ask is, on my AA program on my CopperJohn sight, I shoot 20 yards at: 31.4 and I shoot 10 yards at: 29.9 but then when I shoot 9 yards, my sight is set at: 30.4!!
If you have stepped it off and you are a yard off, this would cause the problem you are having! I will have to think about this some more!!
The reason I ask is, on my AA program on my CopperJohn sight, I shoot 20 yards at: 31.4 and I shoot 10 yards at: 29.9 but then when I shoot 9 yards, my sight is set at: 30.4!!
If you have stepped it off and you are a yard off, this would cause the problem you are having! I will have to think about this some more!!