It all depends... is this like a week-long, high-intensity, tiring Dall Sheep hunt when you're traipsing miles through rugged terrain on mountains where every ounce matters, or is it a day hunt for woodchucks in alfalfa fields where you're walking around on more or less smooth ground where a couple extra pounds is no big deal?
If I'm hunting woodchucks, a nice tall bipod mounted to the gun would be in order. If I'm hunting sheep, Art's suggestion of a sling would be appropriate.
Also, grass "tall enough that a prone shot is impossible" doesn't preclude kneeling, so I'd combine that with the sling.
I personally find a good sling to be far more steady than shooting sticks.
As for the wind, if you *know* it's a 10 mph, steady and consistent wind all the way to the target (good luck with that!), then it's a non-factor. Any competent shooter will know or have charted wind deflection with their cartridge so you just make the adjustment.
Maximum distance is going to depend on how all the variables mentioned above play out and how important the target is. If it's a game I'm playing and there are no consequences except losing, I'll shoot at anything at any distance. If it's a small critter like a woodchuck and it's "kill or miss" as is usually the case, probably same thing. If it's an animal that could be wounded and not killed... my own assumptions about the scenario say probably 250, maybe 300 yards... but it depends on a lot of assumptions.