i am going to be getting my m40a3 back from ga precision here in the next week or so, and i am looking to buy a nightforce for it. I have been looking around and am not sure what to go with i know i want zero stop, and the high speed turrets. I am just not 100% sure what magnification to go with. i will be shooing out to 600 yards and the occasional 1000 yards. Should i go with the 3.5-15 or spend the extra coin on the 5.5-22