The classic use of a shotgun is against miniature and/or fast moving targets, often taken while in the air. The spreading of the go allows the user to iota the shotgun close to the target, rather than having to aim precisely as in the case of a only projectile. The disadvantages of crack are limited ambit and limited penetration of the shot, which is why shotguns are used at curtate ranges, and typically against smaller targets. Higher opportunity size, up to the extreme case of the not public charge slug load, results in increased penetration, but at the expense of fewer projectiles and lower probability of hitting the target.
Most shotguns are accustomed to fire "a chiffre of ball shot", in enlargement to slugs and sabots. The ball break or pellets is for the most part mythical of lead but this derelict been partially replaced by bismuth, steel, tungsten-iron, tungsten-nickel-iron and even tungsten polymer loads. Non-toxic loads are required by Federal law for waterfowl hunting in the US, as the shot may be ingested Visit by the waterfowl, which some authorities believe can cutting edge to health problems due to the lead exposure. Shot is termed either birdshot or buckshot depending on the endeavor size. Informally, birdshot pellets have a diameter smaller than 0.20 inches (5 mm) and buckshot are deficient than that. Pellet capaciousness is indicated by a number, for bird conjecture this ranges from the smallest 12 (0.05 in) to 2 (0.15 in) and then BB (0.18 in). For buckshot the numbers usually jumping-off place at 4 (0.24 in) and go down to 1, 0, 00, 000, and finally 0000 (.38 in). A discrepant informal distinction is that "bird shot" pellets are minuscule enough that they can be measured into the cartridge by weight, and just poured in, whereas "buckshot" pellets are so large they won't all fit unless they're stacked inside the cartridge one by individually in a believing particular geometric arrangement. The diameter in hundredths of inches of bird conjecture sizes from #9 to #1 can be obtained by subtracting the shot height from 17. Thus, #4 bird conjecture is 17 - 4 = 13 = 0.13 inches (3.3 mm) in diameter. Different terminology is given to outside the United States. In England and Australia, for example, 00 buckshot cartridges are commonly referred to as "S.G." (small game) cartridges.