I need help deciding on a scope for my 1st long range hunting rifle that is chambered in 6.5-284. I would like to put the Range compensating knobs on it by Kenton or the Bullet Drop Compensating Knobs by Leupold. I need between 20moa and 28moa to get from 800-1000 yds according to ballistic software. I see positive posts about the Sightron 3 but not many about the Sightron 2 Big Sky. Would like some opinions on both of these please. The price makes the Sightron more attractive to me but I don't want to buy another scope later if the Sightron doesn't measure up. Thanks Brian