On my hunting rifle, whenever I get the chance. I don't have a sling or even a carry strap on my AK. I have a carry strap on my SKS but couldn't really sling up with it.
I read "Art of the Rifle" by Col. Cooper and put a 1907 military style sling on my hunting rifle. When I crest a hill I'll put my arm through the loop so I can be slung up faster if I saw something. And if I saw something far enough away to not be running and had time to get into a stable position, I would certainly make sure I was slung up good and tight before making a shot. But for most quick, offhand shots in timber, I would not have the time to use a sling, nor would it be much of an advantage.
I don't carry a bipod on my hunting rifle because although it is only pound, it is out far enough that it always seemed to upset the balance. Plus it has sharp metal corners. I am 6'5" and like to have my hand out farther than most on the forend. The first time you have a knuckle busted off by your bipod, you quickly find yourself reconsidering its advantages v. its risks. If I had a designated long range rifle that was always shot prone, yes, I would have my bipod on it. But for the country I hunt in, though the possibility for a long range shot certainly exists, most shots are taken offhand within 100 yards, and for the vast majority of the others, sitting slung up over a stump, rock, or fallen tree would be amply stable.