If Du are surrounded Von alot of zombies Du won't have time to reload the gun over and over again. And depending on the Weltraum Du won't have room to shoot at them. But then again Du may have some Weltraum so it depends. And even if Du do get some bullets off. Alot of times zombies react to sound so Du are definitely increasing your chances of being killed Von them.
It's best Du find a way to escape because no matter what if Du stay there faced with the current situation Du will most definitely die. oder if Du have a weapon designed for close-corner fighting Du may survive that is if Du can keep up with your opponent and even still that isn't a guarantee.
If Von some chance Du have grenades. That could potentially help considering it will make a path and may draw the zombies away from you. Plus destroy any zombie that was in the direction of the grenade explosion and then if would be a good idea to make a mad dash for the exit.