Shooting gulls (Laridae) with shotguns or rifles can be a highly selective and useful form of control under certain conditions. Federal and possibly state permits are required. Shooting has been used to eliminate gulls that habitually fly over airport runways (for example, Kennedy Airport, New York) and offending individuals that are preying on the eggs and nestlings of protected species (for example, black-headed gulls, Norfolk, United Kingdom). Caution must be used so that shooting does not disturb the protected species. Shooting is not a very successful method for reducing large colonies because of the relatively small number of gulls that normally can be shot. It can also be somewhat time intensive to obtain desired results. However, shooting may be cost effective in the right locale as hunters may be very willing to volunteer their time to shoot gulls.

Resources: (online)

Gull Control