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Originally Posted by antikristuseke
Every time a shot is fired the barrel vibrates, the less touching it the better since it will allways vibrate the same way giving your bullets a more predictable path, thats why a free floating (barrel only comes into contact with anything at the breach) barrel is preferable for sharpshooting. With gas operated semi automatic rifles this is not possible since there is need for a gas take off point to cycle the action and in some rifles the actiopn begins to cycle before the first roun has left the barrel causing more vibration possibly altering the course of the round.
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The heart of this matter is consistency, however you are correct in principle. The barrel must either be consistently touching the surface of the stock during firing, or nothing at all (best arrangement). USMC snipers have their rifles fully bedded with marine-tex while most target shooters have their rifles free-floated. The only difference between the two arrangements is the purpose of their setup.
As for gas-operated firearms it depends on a number of other variables that must fall into place and function correctly to attain excellent accuracy, but I've run out of time and have to go to work now......