From The TimeSplitters Wiki

Shotgun
Ammo	2/40
Fire Rate bullets per sec/cartridge time	N/A
Reload Time	N/A
Damage (per Single Shot) Head/Body/Leg	N/A
Type	Shotgun
Zoom	N/A
Primary Fire	Fires one shotgun shell
Secondary Fire	Fires two shotgun shells
Games	All

The Shotgun is a very powerful weapon, but only holds 2 shots at a time. This means that you can only fire twice before you have to reload. The Shotgun is extremely effective at close range, a close-up shot to the head can be an instant kill. Before you go into any engagement with an enemy, make sure you have your 2 shots loaded. The time you spend reloading is when you are most vulnerable since the reload time is so long. You should move in as close as you can before you fire, and move around in a random pattern while you reload. This makes you much harder to hit, and you are able to do lots of damage to your enemy.

The Shotgun is nearly useless when fired from long range, so always get as close to your enemy as you can for maximum effectiveness.

The Shotgun x2 can mince opposition, with four shotgun rounds fired in little over a second. even armoured targets cannot withstand more than two vollies.

The Shotgun has appeared in every TimeSplitters game so far.

Its worth mentioning that the Future Perfect shotugn has the longest reload time--specifically ejecting the empty shells, where the previous Timesplitters simply lower the gun offscreen. However, for those "panic situations," its possible to fire one shot off before both barrels have loaded interrupting the reloading sequence. Of course, the reload starts over again.