Re: shooting rest for hunting
The longest Harris swivel model is what I have used to kill most of my long range elk with (including my 820 yard cow elk posted here). If needed, a daypack under the butt works quite well to stabilize the bipod if your rig is up high enough to see over sagebrush or other taller ground foilage.
I have also strapped my Benchmaster rest to my pack frame for use in my 630 yard desert sheep and my 830 yard spike elk. It is more weight to carry than the bipod, but sometimes it works very well especially if you are winded from a steep ascent.
If it's not far, it's boring.