To answer the OP's original question. The best coues deer rifle is the one that you actually learn to shoot and practice with. Most guns can shoot sub 1/2 MOA but most guys shouldn't be shooting past 400 yards and struggle to hit animals (on the first shot) at that distance. So, pick a gun, any gun and get really, really good with it. That is the perfect gun. FYI - this is the perfect time of the year to be sending pills down the tube.