I have two acquaintances who used to hunt hogs for the gov't. Before mgmt got involved, they hunted w/ .22 hornets, primarily 'cause the rifles and ammo were light. (both were small framed, wiry, ridgerunner kinda guys) They killed a slew of hogs w/ hornets, shooting them high in the neck, behind the ear. If there was not that shot, they passed for a better chance.
One of the guys sons got the same job years later. By that time, gov't had flexed its muscles and they were issuing stainless '06's. Kid broke his Dad's record, primarily cause he could shoot at any angle he saw fit.