For times where I want to (mostly) take the 'shooter' out of the equation for accuracy testing, I like the Caldwell Stinger rest better than their Lead Sled.
If your gun(s) have a front lower pic rail, then a bipod (doesn't have to be anything expensive) at the front and a bag at the rear works great, for target work or just chrony work.
Double bean bag set up, as suggested above, will work too. However I find my rifle to be less stable in the upright (shooting), or even laying on its side position when I am not holding it (like when I am filling the next magazine). So I rarely use that set up.