What model BB gun are you asking about.
BB's are round and are .175 caliber. Pellets are not round and come in different shapes and sizes. If the gun or rifle is legal then the BB's and pellets are legal.
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Yes if the power of the BB gun is >200 FPS (Feet Per Second) and if the pellets are >0.25g Source: I have a 450 FPS BB gun with 0.28g pellets and it will go through insulation foam with ease and scar you if you get shot by it...
That is where the pellets are stored in the gun.
You don't. It strictly a BB gun. It is not designed for Pellets.
The gun must be designed to shoot both BB's or Pellets. If it is not designed to do so then it is not recommended.
It can be referred to as a pellet gun or air gun.
Air gun pellets are made out of lead or some other soft material.
pellets, powder
There are a few things one can refer to when speaking of pellets. There are wood pellets which one can burn in a wood stove. There are pellets for guns such as BB gun pellets as well regular bullets are called pellets too.
Airsoft is legal in many countries. Any gun that shoots plastic pellets are airsoft guns.
If you are asking about a BB gun, Then they are inherently inaccurate. If it's a pellet gun, then use heaver pellets. Yes Pellets come in different weights. Heavy pellets fly slower but much straighter than light weight pellets.