This is a video of me shooting my 3.5" .460 double-action fairly quickly with full-power .460 ammo. As you can see, I'm not a big guy at about 140 soaking wet.
http://vid908.photobucket.com/albums/ac290/nebmike/IMG_5525.mp4
I use the exact same grip and stance with this gun as I do with any other revolver I shoot. I grip as high as I can with my shooting hand and wrap my off hand firmly. Its basically an isosceles stance with a bit more front-to-back separation of my feet.
You'll see a lot of videos where guys have trouble keeping both hands together under recoil - the shooting hand and gun will jump completely out of the support hand. Obviously, if you need quick follow up shots, that is not what you want to happen.