Reloading for 600 and 1000 yards

[Allen]

I usually do load development at 200 yards. I go by the theory that a "good" group is going yo be good enough at 100 yards, but a group that's "good" at 100 doesn't always seem to mean its good enough at 200. I wouldn't like to go out further though, just in case a load walks low or high, you still have plenty of paper to record it, especially if your shooting multiple loads on one piece of paper.