Quote:
If I shoot a 1"group @ 100 yrds will my group size be 10" @ 1000 yrds
or will the group size remain the same at 1000 yrds
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In the real world, you can expect an absolute minimum 10% MOA increase in group size per 100 yards.
MOA is "Minute of Angle". One MOA at 100 yards is 1.047 inches, generally considered to be 1 inch. It's an angle, so it's growing larger with distance, double the distance, double the size. Triple the distance, triple the size. Your bullets, unless they all go through the exact same, single bullet sized hole, are dispersing at an angle. They all left from one hole, aimed at the same spot. If they weren't moving away from each other, they'd all hit the same spot.
As mentioned above, there are compounding errors causing that dispersion. Those errors don't stop and remain constant, they grow. So, for an absolute minimum, a 1 MOA (1 inch) group at 100 yards will be 1.1MOA (2.2 inch) group at 200, a 1.21 MOA (3.63 inch) group at 300, 1.33MOA (5.32 inch) at 400... etc, etc.... out to 2.356 MOA at 1,000 yards. 1,000 is (obviously) 10 times as far as 100, so 1 MOA is 10 times as large... in other words, 1 MOA at 1000 is 10.47 inches. So, that 1 MOA (1 inch) group at 100 will be AT LEAST 2.356 MOA (24.66 inches) at 1000.