My "open country" hunting scopes are ( I don't do the LR hunting thing):
2.2-9x42 Swarovski
2.2-12x42 Leupold VX6HD
4.5-14x40 Leupold VX3
All have enough magnification to hit an 8" target at 600 yards. I've done it with a 1-6x24 sitting on my 3Gun carbine.
My scopes that I regularly shoot distance with with have external adjustable turrets, parallax adjustment, 30-34mm tubes and 50mm + objectives with MIL reticles:
Leupold MK4 6.5-20x50
Vortex Razor 5-20x50 Gen 1
Vortex PST 4-16X50
They and their mounts are heavy and they sit on heavy rifles.
Lots of guns can hit an 8" plate at 600, the question is how many shots to do it, and how consistently. IMHO IF you want to do 600 regularly (easily) for 1st rd hits, you start getting into specialized equipment; optic, rifle, ballistic app, and something to get your conditions (Temp, pressure, humidity) and elevation delta between shooter & TGT.
Even with all of the above, there's the wind between shooter & TGT to contend with and for that there's no real technical solution. My Kestrel for example will give me wind at shooter location, but 600 is a ways and the wind can be very different from shooter to tgt. There's no fix other than practice, reading the wind is part science and art. We did it as a team with a spotter.
During OEF my organization did a project targeted towards company grade commanders in conjunction with the AMU and Sniper school at Benning for the employment of snipers and DMRs. One of the chapters was an honest assessment of the 1st round hit probability at distances on a man sized tgt. Those were realistic probabilities that an awful lot of shooters on forums seem to be able to exceed.