Originally Posted by cornchuck
Thank you for the reply. I do know that I have had some really tight groups at 100 yards but opened up when I go out further.
I know what you are saying but how do you know what is making the groups open at 200 as compared to 100 ? Is it extra wind you can't read or shooter error etc.
All long range loads need to be proven at the ranges they will be used at and some that shoot well at 100 or 200 may be no good at some longer range sometimes due to lost velocity and going subsonic .
100 is just the starting point and I find I can see and aim better and wind variables are reduced at the closer range as I have flags out to 100 . I try for the best 100 yard groups with enough velocity to stay super sonic at the range I want or as far as I can get .
I just find it is way more convenient to start work at 100 when a chronograph is also being used .
You also want a low velocity spread as Bart B has mentioined I get the best group I can at the best velocity with the least velocity spread.
There is no rules and no right or wrong as far as what range you develop a load at , it is a personal choice .
Another thing I found was that at 200 walking back and fourth up a hill every time I wanted to retrieve targets and measure groups after a few times fatigue was becoming another accuracy issue that opened groups. If you are young an fit then it may not matter but at my age with my war injury it does. It's a personal choice .