Orca (also known as Orca: The Killer Whale) is a 1977 adventure horror film directed by Michael Anderson and starring Richard Harris as Nolan, a captain of a whaling boat who catches large marine animals in high seas near Newfoundland. Nolan's hunt for an orca leads to the death of a pregnant female orca. The male orca starts revenge against Nolan, his crew and other people of the coastal village, showing high intellect. Nolan has to go to sea to find and fight his nemesis. The movie is based on Arthur Herzog's novel of the same name.
The following weapons were used in the film Orca:
Greener Light Harpoon Gun
Nolan uses a Greener Light Harpoon Gun in several scenes.
An Ithaca 37 pump action shotgun is one of the guns on board of Nolan's boat Bumpo. Nolan uses this shotgun in the final scene, until it switches to Remington Model 760 BDL (see below) due to a continuity error.
Darne "Canardière Portatif" Waterfowling Gun
An extremaly large gun is also seen in Nolan's hands. This is a Darne "Canardière Portatif" waterfowling gun in 4 bore, with rolling block breech. The gun doesn't fire on screen.
The only good image of this gun is copyrighted with a watermark, so the link is here instead of a gun image: Rolling Block Single Shot 4 Bore "Canardiere" Waterfowling Gun by Darne.
Winchester Model 70
Nolan also uses a Winchester Model 70 with sniper scope in several scenes.
Remington Model 760 BDL
One of the guns on board of Bumpo is a pump action rifle. It appears to be Remington Model 760 BDL that has flat-side pump unlike the rounded one on the basic model. The rifle is seen in hands of Paul (Peter Hooten) and Umilak (Will Sampson); in the final scene Nolan's Ithaca 37 shotgun switches to this rifle due to a continuity error.
Various long guns
Two more long guns are seen in the rack on board of Bumpo.