could someone tell me when it became illegal to use slugs(except quantico) in pw county? also- i thought you could use a muzzleloader in pwc during the reg gun season. did this change at the same time?

could some one tell me what is the difference between these 2 hunting regulations?

.9. No hunting with shotguns loaded with slugs.
45. All rifles, pistols, or shotguns loaded with slugs prohibited for any hunting.

thnaks