"The TP-82 was a triple-barrelled Soviet pistol that was carried by cosmonauts on space missions. It was intended as a survival aid to be used after landings and before recovery in the Siberian wilderness.
The pistol could be used for hunting, to defend against predators and for visible and audible distress signals. The detachable buttstock was also a machete that came with a canvas sheath.
The upper two shotgun barrels used 12.5×70 mm ammunition (40 gauge), and the lower rifled barrel used 5.45×39mm ammunition developed for the AK-47 assault rifle. "
This firearm is a puzzling design. It is basically a double barreled 40 Gauge shotgun on top of a single shot pistol. Very tiny shot shells. Maybe good for grouse? The single shot 5.45x39 is an armor-piercing equivalent of the US 5.56x45 used in M-4 and M-16. There are much better options for protection from wolves. It weighed 3 1/2 times as much as the Makarov pistol it replaced. The Makarov magazine held up to twelve 9 mm rounds, which would give a wolf pause for thought.
Fired inside the ISS, the shotgun's effect would depend on the size and composition of the pellets. The 5.45x39 has steel core bullets (sometimes hardened steel). Fired from a rifle, it will go through several car doors. Even with a short pistol barrel, it would certainly pierce the ISS hull, but leave a small "exit wound" inn the hull. Used on a Cosmonaut, however...
The Soviet explanation that the weapon was intended as a survival weapon is a bit lame. Was it planned to be used in orbit against a berserk crewmember? If the shotgun pellets and powder load were chosen carefully, they could do serious harm to crew but maybe not the hull. The 5.45x39 would be lethal and leave a small, repairable hole in the hull.
“Two in the chest and one in the head”?
Its crazy to think you are actually safer with a gun than without one in a spacecraft, but many people feel that way about their homes.