Well, yes and no. Support should go under the forearm, not the barrel. When a support is placed under the barrel, it MAY change the point of impact. The pressure of the forearm on the barrel may change, and the normal vibration of the barrel is changed. For a hunting grade .22 rifle used to 30 yards, you probbably would not see a difference. For a long range target rifle used at 500 yards, you WILL see a difference.
If you mean a muzzle brake or barrel weight, yes. It can change the vibration pattern in the barrel when the rifle is fired, changing the point of impact. Anything added to a barrel, such as a sound suppressor, will affect the zero.
The zero on Carlos Hathcocks rifle was 700 yards.
Yes. It starts at zero- and when fired, begins to accelerate until it reaches it's greatest speed- usually before getting to the muzzle of the gun.
zero west
Zero. A barrel or crude oil contains... crude oil.
25 meters
No, you can clear that up easily. Just do a barrel roll. For more extreme cases of accidentally a coca-cola bottle, do a barrel roll while dividing by zero, although this is admittedly dangerous.
What it does in a nutshell is relieve the stress in the steel of a rifle barrel by freezing at about 315 degrees below zero, subsequently changing the molecular structure of the steel. This process not only straitens out the grain of the steel, it makes the barrel more heat resistant and in the case of a machine gun it would require less barrel changes in combat. It slicks up the bore increasing muzzle velocity and in many cases increases accuracy up to 50%. Bluing on fine firearms becomes more rich and lustrous, while the firearm is just plain more durable and easier to clean. Much like a caterpillar going into a cocoon and emerging as a butterfly. Uncle John Cajun Cryogenics
The formula is, quite simply, that the momentum before and after the shot is the same. You can assume that the momentum before the shot is zero (because the rifle and the bullet were not moving), so after the shot, the total momentum will also be zero.
Impossible to answer until you define what BZO means.
These are more of a novelty item than a working firearm. Heavy and difficult to zero the rifle barrel. Of course parts are impossible so make sure it works. Check around the hinge pin. A specimen in 90% condition will bring about $300.
The scope itself - Zero. The reticle - see related links below