Just curious on what type of scope is best for long range target shooting? For 600yds or so. Variable or fixed power, reticle type. What power range etc. I want to build a 6BR and want to start thinking about optics as well, but I just don't know what people are using at these ranges or in 600yd competitions. I've got a Weaver T24, but didn't know if that was too much/not enough scope. I obviously want something that will track well. Any recommendations?