This mod allows you to load more than two shells in a shotgun.
This mod does not give you infinite ammo, it only allows you to load a lot of bullets in the shotgun so that you free up inventory space.
Use the ShowAmmoCount Mod to see how many bullets you have.
If you are using the BetterShotgun Mod, then uninstall this one and enable the "ReloadNoLimit" option in the BetterShotgun config file.