rost, how important is velocity with putting the bullet to sleep? I am working on a load with 115g Berger VLDs(.257) and I am not getting the groups that I want to get at 300 yards for a varmint target shoot. (Shoots really well at 100y) Should I speed it up or slow it down? Will that matter?

I am going to shoot the same load at 600y and see how it shoots.

Lastly if you are working up a load for a particular distance, do you shoot off a bench at that distance or do you load develop at 100 yards?

Do you shoot a load at different distances to see when it goes to sleep?

Sorry for all the questions.