When I go to the gunclub, with concrete benches, I use a front rest and a bag under the back, I can pinch in different directions to get the gun steadied with no help from my hands on the gun.
At home on my little range, I use the tailgate of my truck. Just drop the tailgate and sit on a bucket or cooler. Use a big bag in front and small bag in rear. They can both be manipulated in various ways and shoot just as well as the front rest. Just takes a little patience to find the right combo each way.
The tailgate bench works very well though.....
Andy
psssst. (Be sure to use hearing protection. It does echo pretty good out of the bed of the pickup.
)