why do you need 700 headshots to get to round 41

me and AL don't glitch its pointless what we did do is practice way too much and get good at running round ok i will explain the strategy.

first hold the balcony using normal guns pref machine guns to max points (also open all doors and get the packapunch machine online) then upgrade and you can hold the balcony until early 30's easily especially if you have a upgraded waffler (hence why AL had so many kills) my job at that lvl is to hold them off on the balcony only, i have upgraded raygun+ machine gun ie: MG or a shotgun at this point AL has raygun/waffler we will both have monkey's by then too and all perks.
now comes the tricky part when the zombie waves are getting to hard to stand and kill or u have low ammo u need to start running starting from the far teleporter where you hold them off for as long as poss then teleport to the packapunch machine and alternately either run left or right to the drop off point by the bridge standing there as long as poss before dropping down.
now u can use the electric fences to help kill zombies but what we also do is i have the flamethrower upgraded and from the drop off you will get large bunch of zombies to fry repeatedly and u back towards the far teleporter while i am doing this AL is getting more grenades and watching my back.
as the flamer does not need ammo you should easily get enough points to keep teleporting (my job) that leaves AL points to buy ammo ect

now just keep at it until u screw up

edit to add another tip
don't use any max ammo's that are randomly dropped (not ones after dog round) until you really have to we are pretty sure it helps you get them in later rounds when they are needed more but no way to confirm this its just from our observation after playing far too many games of zombies lol