Most any deer rifle will kill a deer at 400-600 if the shooter can do his part.
Yep. A 260/308 with proper bullets is solid out to 600yd. A 7mm Mag is a 1000yd rifle with proper bullets, IF the rifle is accurate enough, and an even bigger IF the shooter is accurate enough. I don't get to practice enough to be deadly at 1000 myself.
