Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 131, § 70

A person shall not, during the open season when deer may be hunted lawfully with a shotgun, hunt a bird or mammal with a rifle, revolver or pistol or by the aid of a dog, or have in his possession or under his control in any wood or field, a rifle, revolver or pistol, or a dog. Nothing in this section shall be deemed to prohibit the use of dogs to hunt waterfowl in coastal waters and salt marshes during the open season on migratory waterfowl.

Notwithstanding the provisions of this section, the director may authorize the use of primitive firearms or shotguns with a rifled bore for hunting during any period when deer may be hunted by means of a firearm under rules and regulations promulgated in accordance with section five.