I have and use regularly:

30-06
.22
12ga

Soon i`ll be adding .223 just because ammo is so cheap you get a lot greater distance, and the stopping power at a greater distance than the .22. (And It wont explode a small animal like a 30-06 will)

NOt to mention very common, and did I mention cheap? By the amo can full <img src="/images/graemlins/smile.gif" alt="" />

BTW: Watch Wal-Mart for 12ga I got it by the case/flat there on sale super cheap.