Bushnell 10X40 is okay for the task. Great for the money but not a wonder scope. Fixed parralax, heavy mildot reticle and 1/4 moa clicks. $200 used all day, a little more for brand new. 80 moa of internal adjustment should get most flatter .308 loads to 1000 but a canted base would be a good investment. A bit above your budget is the Sightron Siii 10x42 MMD (modified mildot) with hash marks inbetween the dots for finer ranging and holdovers. Moa clicks and adjustable parralax. 150 moa internal adjustment wont even need a canted base to get to 1000 with a .308. $620 at Mystic Precision. If you can up your budget to about $1000 then take a good look at Sightron Siii 6-24 or 8-32 with your choice of reticle and turrets. More magnification is nice but only if clarity is there. A cheap high mag scope is going to give you grief. Poor glass, inconsistent internals, tiny eyebox, poor light transmission etc will have you wishing you'd spent more.