Thick barrels offer a lot of stability, but remember that weight goes up fast. I have a .54 bench gun with a 36 inch barrel that's 1.5 inch across the flats. It weighs about 35-40 lbs. Granted, it has a huge chunk of wood for a stock, but the weight most comes from that barrel. I think for a bench gun, that's about optimal though. It sits solid yet isn't unmanageable. I haven't shot it yet so I can't tell you how it performs. It's a project gun that isn't quite finished yet.