I agree with Beet here, we need a bit more info. You only mentioned this is going to be a backpack/brush gun, so what does that mean to you. As SkyScrapin mentions above, his 12" 6.5 Creed goes transonic just before 900 yards (and that's with his atmospherics, depending on where you live, your cartridge, barrel, etc. you could be/likely will be different). As a general rule, trying to get a scope that can do everything (like a 2.5-20) ends up having its compromises, if you're okay with a somewhat tight eyebox, finicky DOF and parallax the NX8 2.5-20 is a really good option, but you really don't need more than 15x at the ranges you'd be shooting unless you need to PID a jackalope's tines. You also didn't mention weight, as a backpack/brush gun I would think you'd want something a bit lighter which really narrows down your options. For $2k and under consider the NF ATACR 4-16x42, the Steiner T6Xi 3-18x56 (pretty heavy but great scope), the Burris XTR IIIi 3.3-18x50, the Leupold Mark 5 3.6-18x44, the Delta Stryker 3.5-21x44 and of course the aforementioned NF NX8 2.5-20x50. Except for the Steiner these will all be under 30oz. Also check out the new Steiner H6Xi 2-12x42 with their soon to be released Mil reticle as 12x gives you more than enough to do what that rifle is capable of doing. Lots of different options, when we know more about your intended purposes for this rifle we can help narrow things down a bit.