You need to think of it as a cone starting from the end of your gun barrel and getting ever larger the further away your target is.
1/2" MOA = 3 or 5 shot groups measuring from the furthest outside impacts at the following distances- 1/4" @ 50yds., 1/2" @ 100yds., 1" @ 200yds., 1 1/2" @ 300yds.
1" MOA = 3 or 5 shot groups measuring from the furthest outside impacts at the following distances- 1/2" @ 50yds., 1" @ 100yds., 2" @ 200yds., 3" @ 300yds.
2" MOA = 3 or 5 shot groups measuring from the furthest outside impacts at the following distances- 1" @ 50yds., 2" @ 100yds., 4" @ 200yds., 6" @ 300yds.
5" MOA = 3 or 5 shot groups measuring from the furthest outside impacts at the following distances- 2 1/2" @ 50yds., 5" @ 100yds., 10" @ 200yds., 15" @ 300yds.
10" MOA = 3 or 5 shot groups measuring from the furthest outside impacts at the following distances- 5" @ 50yds., 10" @ 100yds., 20" @ 200yds., 30" @ 300yds.