The Pump-action Shotgun is one of four Shotguns available in Red Dead Redemption. Its six rounds give it the largest ammunition capacity of any of the in-game shotguns, but at the expense of slower reloads.
Like almost every other weapon in the game, combining Dead Eye with this shotgun drastically increases its range. It should be noted that the shot still spreads, meaning aiming for the head in Dead Eye of a target very far away will not guarantee an instant kill.
This weapon is very effective in Multiplayer. It has largest magazine of all shotguns found in the game, and it does have a stable fire rate (not too quick or slow), that prevents the player shooting the entire magazine into one enemy.
It's also quite powerful, as it can perform one-shot kill at close ranges (about 5ft) and 2-shot kill at up to about 15ft, though it loses out to the Semi-auto Shotgun in terms of sheer power. The pump action shotgun has the longest range out of all the shotguns found in Red Dead Redemption. The Pump-action Shotgun can be more powerful than its Semi-auto Shotgun counterpart when within the 1 shot kill zone.
It is also useful for clearing out small gang hideouts.
In promotional pre-release material the Shotgun appeared to be a hybrid between the Winchester Model 11 and 1897, but once the game came out, the in game shotgun was clearly an 1897.
The singleplayer model possesses the real life model's side ejection, but when the gun becomes gold, the action is no longer visible, or it becomes an "under ejection" mechanism, meaning that when the pump is pulled back the spent shell ejects from the bottom (also where the shells are loaded).