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Point is that YES they can fire just like a gun, only without the accuracy. This probably makes them more dangerous.
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If you know anything, anything at all, about ammunition, you would know that it is physically impossible for the scenario you are describing to happen.
A handgun round or a rifle round is a lead projectile, fitted inside a brass or aluminum casing, with a load of powder inside. There is a primer which ignites the powder, which ignites rapidly and propels the projectile out of the casing. The bullet works like a bullet because the force is concentrated inside the barrel of the gun.
A shotgun round is different. It is anywhere from one to alot of projectiles (depending on the type of round) packed into a plastic casing. There is a fabric wad placed between the projectiles and the charge. When the primer causes the powder to deflagrate, it pushes the wad up, which pushes the projectiles out of the barrel.
A gun barrel is rifled. That means there are grooves machined inside the barrel which cause the bullet to spin. The barrel is also designed to funnel the force of the rapid ignition of powderin one direction. Both of these actions causes the round to be lethal. A shotgun barrel may or may not be rifled.
To envision this, picture a football being thrown in a spiral. If the ball was not spinning, it would not go anywhere near as far or as fast.
A round in a fire will do a couple of things. First, the casing will be weakened in a fire, causing it to rupture. This will mean the force of the deflagration of the powder will be funneled to the rupture point and it will not be concentrated solely on pushing the round out of the casing. Secondly, if the round does come out of the casing, there is no barrel to make it spin. It has no force to fly anywhere. It may pop up in the air, but it will not go any distance with any force.
A handgun round, such as a 9mm, travels about 1000ft. per second. The force of a 150 or so grain round travelling at that speed will make i penetrate things. A 150 grain round travelling at the speeds it would reach coming out of a ruptured casing with no gun barrel would not go through a piece of paper.
If a round went through that guy's helmet brim, somebody shot at him, because it is impossible for it to have happened from a round in a fire.