I measure my 100 yd. groups by measuring the outside edges of the group,then subtracting the bullet caliber method.Do I use the same method for 200,300,400,etc.?I have been told that at 200 a 1.00" group would be the equivelent to .500" at 100 yds.Please enlighten me on the correct process! Thank you, Jimmy

Thanks,Abinok! Then a 3" group at 400=1/2 @ 100? In other words:.5 @ 100 1.00@ 200 2.00@ 300 3.00@400 6.00@500 Double the size per 100 yds.? Jim

it goes more like this: 1 inch @ 100 yds = 1 moa 2 inches @ 200 yds = 1 moa 3 inches @ 300 yds = 1 moa and so on so if you shoot 1 inch at 4ooyds you are shooting .25moa, or the equivalent of .25 inch at 100 yards