Having slugs other than deer (in season) is a no,no!
Shotgun ammunition: except as provided below, no species other than deer, coyote, or waterfowl may be hunted or taken with shot larger than #1 birdshot. Except during the prescribed open season when deer may be hunted lawfully with a shotgun, a person shall not have in his possession a shotgun shell loaded with a rifled slug, single ball, buckshot of any size, or any shot larger than or equal to air rifle shot in any place where birds or mammals may be found except on a skeet, trap, or target range between sunrise and sunset, or except for the hunting of coyotes (a) during the prescribed open season for coyotes with shot not larger than FF; or (b) during the shotgun deer season when coyotes may be hunted only with archery, muzzleloader, or shotgun—using slugs, buckshot, or shot of any size; or, except as specified in the annual Migratory Game Bird Hunting Regulations.