Here are my thoughts as I do quite alot of shooting at and beyond these ranges.
I started shooting CF with a 222 Rem 700 Classic,never should have sold it). Shot a true 1/2 MOA at 200yds. Just a lovely rifle. Never took it further then 350yds as it got bounced around in the wind as I was using 50/52gr varmint bullets.
As was said, velocity will not solve your wind drift woes. I had a wonderfully accurate Rem700 in 22/250 pushing 52gr MK's at the expected velocities. At ranges beyond 500yds, it was like hitting a wall.
Pin point accuracy would become spray and pray. By 800yds, hitting anything smaller then a 2MOA boulder was more luck then skill when the wind picked up.
With new gen bullets like the 75 and 80gr Amax, this would be a wonderful cartridge.
I followed that rifle with a 6BR with slow twist. The 87gr Vmax was the best that would stabilize. Man what a difference BC makes in hitting. An accurate rifle and cartridge don't hurt either. Hitting clays out to 800yds was simply a function of doping the winds. Was my first rifle built on a CIL,old Savage 110) action. There were no trigger options at the time so sold it cause the heavy pull was driving me nuts.
For a low recoiling, superbly accurate cartridge/load, I can strongly recommend this combo. Might not be ideal vs all the very high BC bullets but it works for varminting and general plinking way out there. A very strong contender for shorter ranges in F class.
I then progessed to much larger cals and cartridges. All work but get expensive and noisy,brakes required to keep from dislocating shoulders).
I am now going 'smaller' again. The 6.5 Mystic is my idea of a better mousetrap for LR F class. Would work in tactical, plinking, whatever. Relatively low recoil, high BC, reasonably priced to shoot.
This is my one gun/one load set up for F class from 300m to 1000m. I feel a better choice to the 6.5-284.
My 7 Mystic and 180gr Bergers is fast becoming a favorite for 1km shooting. Man, those bullets shoot well. Again, superb in the wind. The 162gr Amax is no slouch but the bergers are just better.
A bit much in recoil, barrel heat/wear, and costs for high volume plinking but for a dual target/hunting rifle, I am very pleased.
Now that I have shot all the major cals, I am going back to my roots and playing with the 223 in a bolt rifle. With the new 75 and 80gr Amax, this has opened up a whole new world of light recoiling, low cost, reasonable wind bucking fun.
For 600yds and in, I can't think of a nicer, more readily available combo. I own a Stevens 200 in 223 and have used it effective at 1km. What a hoot this rifle is,SSS trigger). Accurate, light, makes for a great walkabout varminter and clay buster. I have a Pac nor HB for it to try and max accuracy way out there. Results have been very promising.
I have recommended the Savage HB in 223 to many shooter wanting to enter the moderate range game. Ballistics mimic the 308 with 1/3 the recoil and half the cost. Best part for me is you can shoot alot more before your barrel overheats.
If a shooter wants to use factory ammo or doesn't want to get too technical in tools or reloading costs, the 223 with 75gr Amax is my number one choice now.
The 6BR is next. Of course, all the other variants are included.
From there, I prefer the larger 6.5 Mystic,260AI variant) as I feel it offers a tangible benefit over the moderately large case 6mm,very hard to get new gen bullets up in Canada and ultimately we will be using 243's and variants).
The smallest dual purpose rd I have is the 7 Mystic,280AI variant) and have no issue shooting game within what my Leica 800 can range.
The magnums are next but that is alot of boom, cost and recoil. More then needed for these moderate ranges.
I have skipped the 308 simply because I think the 223 is a better choice/same ballistics. I hate recoil and if I am going to get smacked a bit, I want more ballistics prowess. 7-08, 260R, 243 would all do much better.
Does this answer your question?
Jerry