My guess a person is most accurate from whatever position he shoots from the most. For me I try to practice in several positions. From off hand to prone sand bag supported.

Accuracy -- that is, putting rounds on target -- is key.  A good, solid shooting position is a "must" for nearly all of us.  That's because we don't practice enough shooting unsupported to have developed the habits and muscles and muscle memory that such shooting requires.

 

For example, take the bullseye pistol shooter.  This shooter stands erect, uses one hand to hold the pistol (the other is in his pocket), and stands 90 degrees to the target.  Targets are at 50 feet and the pistol is either a .22 or larger caliber.  The average pistol weighs between 2-1/2 to 3-1/2 pounds.  The bullseye shooter grasps the pistol firmly and extends his arm.  The only thing available to steady his aim are the tone of his muscles and the bones in his arm.  If you have not shot bullseye, then see how steady you are when you take your pet pistol and try to hit a target using one hand at 50 feet.  I'll bet that those sights on your pistol are dancing all over that target -- hitting it will be a miracle.  Why are you so wobbly?  Because you aren't used to holding that arm extended (with or without weight) for long periods of time.  The bullseye shooter continually works to strengthen the muscles in his arm by doing exercises.  When he shoots he also tries to keep the bones of his arm locked from shoulder through wrist joint.  Having good bone support and muscle tone really makes a difference in this kind of shooting.

 

For most of us, we don't get a lot of time to practice with our pet firearm.  Therefore, it becomes necessary that a good shooter uses whatever he or she has availble to them to steady that firearm and make an accurate shot.  (Notice we're talking pistols and rifles here; shotguns are different.  Shotguns are pointed, rather than aimed like pistols and rifles.)

 

For pistols, this means two handed shooting using one of several shooting stances that rely on bones, not muscles, to support the pistol.  If you can shoot from some kind of improvised rest, do so.  For rifles it means using the shooting position that gives the best support for the firearm, the use of a rifle sling, and the use of an improvised shooting rest for the firearm.  The steadier the firearm can be, the more accurate you will be (provided you use proper sight alignment, sight picture, breathing, and trigger control).

 

For shotguns (not considering tactical use in "social encounters" and shooting slugs), the shooter will be pointing the firearm and not aiming it.  That's because you are using shot against a rapidly moving target.  The shooter moves the shotgun to track the target.  The shooter has to figure the amount of "lead" to apply so that in the time between the trigger is pulled and the time the clay bird gets to a place in space, the shot will be there to meet with it and powder the target.  This also applys to the shooting of game birds.  How accuracy is achieved with a shotgun is different than with the rifle or pistol, but it still comes down to putting bullets or shot on target.

yepper

 

i use the "weaver"

 

which is almost like firing from support