bullet?
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Well, a bullet is PART of a round of ammunition. It is actually one CARTRIDGE. A catridge consists of the cartridge case, primer, powder, and bullet. The bullet is the part that is fired out of the barrel.
For some purists, the term "round" refers to a shot or a bullet after it is shot. For most other people a "round" refers to one cartridge of ammunition.
Think of it this way: The ammunition manufacturer loads a bullet into a case to make a cartridge. The shooter loads the cartridge into the firearm and pulls the trigger, firing a shot or a round AKA sending a round downrange. The bullet then hits the target.
A round is loaded into a gun. The gun is then cocked and then fired.
Sorry, but we need more information on the term "round barrel gun".
BB gun. Fires a round BB.
A "Round" is usually how many shots are in the loading chamber. it can be one or many. A BB gun can carry 100 ROUNDS but only fires one ROUND at a time. A Machine gun fires many rounds in a "burst".
no
900
the measurements of a round are not measured in that way, nor does the size of the gun have anything to do with how powerful it is
One shot
You must specify whether you mean in a long gun or a hand gun.
What model BB gun are you asking about.
Type of rifling/twist.
The event that sparked the recent round of gun control talks was when a boy brought a gun to school and killed twenty children and seven adults. Have a good day!