I know some may dissagree with me on this but I usually sight in on what Power I will use most for Hunting. On a Variable Scope say 3X9 I will use 5 Power. I found that if you use your highest Power say 9 Power that it will show every little bit of your movement even wheen you think your holding still, and this movement will drive you crazy trying to hold still and get sighted in. And as Lemoyne siad above do this off a Lead Sled as your POA may be different. Yes a Sled will hold the ML still for a sight in at 9 Power, but will you be able to hold it as still as the Lead Sled if you have it on 9 Power, probably not. So do it as you would in a normal Hunting situation. Once sighted in at a medium Power then try a higher Power. Good Luck!
(BP)