There is a thread on another site about doing testing for long range shooting at 100 yards. There is a lot of talk about being able to decipher 100 yard groups to determine how the load will shoot at much longer ranges. I am not that skilled- I've seen lots of groups that shot tiny little groups at 100 but opened up pretty bad beyond say 300. In my limited experience a load thaat shoots well at 300 will shoot out to 1k.