Search:

I say 100 & 300 because your 100m group will be small enough to get a good idea where it is and you've got enough leverage to estimate trajectory difference . Not so much drop between 200 and 300...

A mate says he's chronied his 18" 7mm08 with factory winch ballistic Silvertips at 2550.
Most reliable way is to shoot at 100m and 300 m on the same day with same ammo and choose a velocity that...