Last year, one of the items of shooting equipment to receive a Best of the Best award was the Rapid Acquisition Shooting System, made by R.C.B.S (and who there among ye can tell me what that acronym stands for, and how it came to be?). We used it in our rifle tests, and the three of us who did the shooting loved it.
Despite its somewhat overblown name, the R.A.S.S. is simply a portable shooting bench--a stand with four legs, a seat, and a rifle brace that supports the fore-end and the butt. The R.A.S.S. is heavy and hyper-engineered, but it is very quick to set up, can adapt to just about any uneven terrain, and is dead solid.
I've found it most useful at the rifle ranges I use, both of which have fixed backstops and benches. If you want to shoot at 25 yards or 50 or 100, you're fine, but if you want to shoot at 5 yards (getting a scope on paper) or 10 yards (air rifles) or 250 or 300, you're SOL. So what you to is take your R.A.S.S. to the range and your problems are solved.
Or you can take it groundhog shooting and you will not have to lie prone on a fresh meadow muffin in order to be steady. Prairie dog shooting? A natural.
The real-world price for the R.A.S.S. is around $350. It's worth it, and then some.