I have the same scope or did anyways on my 7mag. It is set up for max zoom to match the BDC. If you google search you will find the manual with common calibers and bullet selections. U can do the math to figure out ball park what each magnification will do to the point of impact. At 7x you have(theoretically) doubled your field of view which doubles your amount of usable drop in inches. This does not double the range u can shoot because we all know of the decaying arc that is the bullets trajectory. If u want I'm bored right now and if you send me your info on the bullet your shooting and I will match it up for u.
