I've always sighted my rifles for a 200-yard zero. With that zero, at 535 yards a .243 is gonna need a holdover of around five feet in order to hit a target.
Any sort of breeze, and some two feet of wind drift comes into the deal.
With a laser range-finder you can tell 535 yards. Without one, you're guessing about "Aw, somewhere between 450 aand 600..." Good luck.
IOW, color me dubious.