I like to conserve bullets by hoarding the zombies all together untill every zombie is in a line then unloading two clips and killing them all not only saves your bullets but builds you points up so you can afford perks and weapons. Got to have a lot of running room so you cant get boxed in.
I tap the trigger and always aim for the heads. Some don't like it, but I think it's better for conserving amo. Which in the higher rounds you will need. that and wherever you want to hold out, put a few claymores around just in case you get overrun
personaly for my zombies games i turn the power on as quick as possible (usually wave 1 or 2) and rack up s many points as possible in the early rounds and then set up a defense position
personaly for my zombies games i turn the power on as quick as possible (usually wave 1 or 2) and rack up s many points as possible in the early rounds and then set up a defense position