30-30 would absolutely destroy a coyote, no question there. My vote would be the .243 because of the versatility of the cartridge. Although if the maximum distance is only 100 to 150 yards, you could probably even use something as small as a .17 HMR with good shot placement. I know some farmers in New Castle that use a .17 for their Coyote problems. Very little recoil with rimfire.