I'd have to say Idaho is right up there.
Only percussion caps, musket or #11, no 209 shotgun primers,
Only ratcheting hammers, no inline hammers,
Only loose powder, no pellets,
Conicals or roundballs only, full bore projectiles, no sabots,
Open or peep sights only, no scopes.
Minimum .45 caliber for deer, .50 caliber for elk.
Here in Idaho, someone is trying to regulate muzzleloaders into extinction.