A lot of my shots are placed offhand in the standing posistion...many times leaning against something for support.
Then there's a favorite sniper posistion I have, where I am able to sit comfortably. The barrel goes into a "v" that is formed by the vinyl-coated chainlink fence. This is very important in order to land the 75~100 yard shots that my 350 .22 can perform. There are hundreds of Vs to choose from...so I just pick the V that gets me feeling comfortable. I have a 4 inch piece of garden hose that I've slipped over the 350 barrel so it doesn't get scratched, and it also helps with cocking. Just the tip of the barrel pokes through the fence, so that if anybody looks, they won't see the "barrel of a gun" sticking through the fenceline, which runs for blocks.
Then there's the what I call "combo position". Istand behind a blind that I have set up, and rest the barrel on a nice cushy cloth thats folded up many times to give a lot of cushion to the barrel movement. The cloth rests on a crossbar of the blind. This position has proved to be very deadly.
If things are too quiet...which is rare...then I take shots out of an upstairs window, with the window open about 3~4 inches. Me sitting in a chair or on the carpet, barrel resting on the window sill, but not poking out of the window, so if somebody happens to look they don't see the "barrel of a gun" pointing out of a window, causing neighborhood panic.