Shotguns

There isn't a wide variety of Shotguns in Resident Evil 4, but each one has it's own purpose. One has the power, the second has the speed, and the third has the ammo capacity.

Shotgun

  

The Shotgun is a 12-Gauge Pump-Action shotgun. In Easy mode, the shotgun will already be available in your cache or in Normal and Professional, you can find it in a house in Chapter 1: Part 1, or you can buy it from The Merchant for 20,000 PTAS. It will be unlocked by default in Separate Ways.

The real life counter part looks like the Mossberg 500 or Winchester Model 1200.

The Shotgun in the main game takes up 16 cells (2x8) in the Attache Case, while the Shotgun in Separate Ways takes up 10 cells (2x5).

The Exclusive Upgrade for the Shotgun replaces the 12-Gauge Shotgun Shells with 12-Gauge Shotgun Slugs. This allows the Shotgun to keep its high damage at any range. The Exclusive Upgrade costs 40,000 PTAS.

Firepower

Level 14.00 PTAS
Level 24.515,000 PTAS
Level 35.020,000 PTAS
Level 46.025,000 PTAS
Level 57.030,000 PTAS
Level 68.040,000 PTAS

Firing Speed

Level 11.530 PTAS

Reload Speed

Level 13.030 PTAS
Level 22.437,000 PTAS
Level 31.6715,000 PTAS

Capacity

Level 160 PTAS
Level 288,000 PTAS
Level 31010,000 PTAS
Level 41212,000 PTAS
Level 51515,000 PTAS
Level 61820,000 PTAS

Riot Gun

The Riot Gun is a Pump-Action Shotgun. Its real life counter part is the Benelli M4 Super 90. The Riot Gun takes up 16 cells (2x8) in the Attache Case.

You can buy it from The Merchant for 32,000 PTAS in Chapter 3: Part 1.

The Exclusive Upgrade increases the Firepower for 120,000 PTAS.

Firepower

Level 15.00 PTAS
Level 25.520,000 PTAS
Level 36.024,000 PTAS
Level 46.528,000 PTAS
Level 57.032,000 PTAS
Level 68.050,000 PTAS
Exclusive10.0120,000 PTAS

Firing Speed

Level 11.530 PTAS

Reload Speed

Level 13.030 PTAS
Level 22.437,000 PTAS
Level 31.6720,000 PTAS

Capacity

Level 170 PTAS
Level 2910,000 PTAS
Level 31112,000 PTAS
Level 41315,000 PTAS
Level 51520,000 PTAS
Level 61725,000 PTAS

Striker

The Striker is a high capacity Semi Automatic Shotgun. Since it's Semi Automatic, it fires faster than the other two shotguns. The Striker takes up 10 cells (2x5) in the Attache Case.

You can buy it from the Merchant for 43,000 PTAS in Chapter 4: Part 1.

The Exclusive Upgrade increases the ammo to 100 rounds for 60,000 PTAS.

MOVEMENT SPEED GLITCH

The Striker also has the ability to slightly break the game with regards to Leon's movement speed while in-game. This glitch is a rather simple one to activate however.

Step 1) Equip the Striker

Step 2) Aim the Striker but as soon as you hit the aim button open your inventory BEFORE the laser appears

Step 3) Equip another item in your inventory. Preferrably a grenade or an egg for maximum benefit. 

Step 4) Leave exit your inventory and you should now be able to sprint at approximately 1.5 times the normal sprinting speed. 

Note that several things can cancel this glitch. These things include taking damage, quick-time events, cutscenes, opening doors, vaulting over objects, climbing up laters, and jumping through windows.

Firepower

Level 16.00 PTAS
Level 27.025,000 PTAS
Level 38.028,000 PTAS
Level 49.032,000 PTAS
Level 510.040,000 PTAS
Level 612.060,000 PTAS

Firing Speed

Level 11.100 PTAS

Reload Speed

Level 13.000 PTAS
Level 22.408,000 PTAS
Level 31.6715,000 PTAS

Capacity

Level 1120 PTAS
Level 21410,000 PTAS
Level 31612,000 PTAS
Level 42016,000 PTAS
Level 52418,000 PTAS
Level 62825,000 PTAS
Exclusive10060,000 PTAS