I have a Pentax 20x60 PCF, I carry them all day long in my chest, I have been able to find bedded whitetails at 800 yards, couldnt tell what they were, but found them!!!
The only reason why I dont carry all day long a spotting scope is because I dont have one!!!
I truly believe that one of the most important things about hunting is been able to find your prey (and binoculars and spotting scopes help you with that), after game is found you can plan anything you like: stalk them, prepare for a long range shot or whatever, but if I cant find them, then that is where it all ends!!!
To stabilize my binoculars, I sit down, put my rifle but down between my legs, with the barrel aiming at the sky, in the middle of the binoculars, and stabilize my hands in my knees, and against the barrel, it works for me pretty well, thats is what I have. Looking forward to get a spotting scope and a tripod, that sure looks more comfortable and more stable.
Just my two cents!!!