To answer that question effectively we need to look at ballistics. BBs are usually listed as .177 caliber, but they are actually about 4.4mm in diameter. They are normally made of steel, which is lightweight when compared to denser metals like lead. This gives the average BB a weight of around 5.1 grains.
A high-powered BB gun can propel a BB at about 750 feet per second. A 5.1 grain projectile moving at that speed has around 6.3 foot-pounds of energy when it leaves the muzzle. This drops off very quickly, owing to the lightweight nature of the projectile. Even only 10 yards away, the energy that projectile possessed has dropped significantly.
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