Longer shots can be done from a sitting position if you're on the right ground. Need just the right slope of ground away from the tree and no big root base under your rump. Shoulder solidly against the tree and knees for the rest. Years past I have done it standing leaning against a tree but I can't anymore, too shaky. Darned neuropathy took away my steadiness. I can still take them offhand up to around 35 yards or so. Every now and then you can stumble across the perfect spot with two trees you can wedge yourself comfortably between for a solid rifle shooting rest, but still have a great view across the woods. If the sun doesn't get on you and make you go to sleep......
