I just bought a Z6I with the tds rec. with 2nd plane. I am wondering now how far will these long range 2nd and 3rd line be off per say if I'm on 6 power vrs 12? I plan on putting it on a 7mm rem mag. I will sight the center in at 3" high at 100 and should be good to 250. Then the 2nd one for 300 and the 3rd for 400. The last for 500. Does this sound about right. I will probably use 12 power for a long shot but what happens at dark an have to lower the power to see better. I do have a lite recticle also. What I don't understand about is when people say that the good thing about first focal is you can turn the scope up to see the X hairs better in low light. I thought the principal was to use low power at low light so you don't magnify darkness?