A typical 12 gauge shotshell loaded with 00 (double ought) buckshot will contain nine pellets, whereas a shell loaded with bird shot may contain hundreds of much smaller pellets.
Lethality and range varies with shot size, with larger, heavier shot naturally carrying its more considerable energy farther than smaller pellets.
Shot shells are also available for .22 caliber rimfire guns and for handguns, though their performance is marginal at best. They are meant for very close range use on small and/or hard-to-hit vermin such as rats and snakes.

