A just put a Nikon Monarch 2.5x10x50 scope on my A-bolt 7mag and it's been a long time since I've sighted one in from scratch. I've heard several comments on how a scope's (with a BDC type reticle, mine is just Nikoplex standard crosshairs) point of impact is affected by changing the power setting. At what power setting should I sight in to remain accurate through the entire power range? Does it even matter with standard crosshairs? Please help, I'm headed to the range tommorrow a.m. and then to the camp.