You can survive Horde nights without having to use a ton of ammo (or very little at all).
I did a recent playthrough where I was set at Survivalist, Intelligence Build, max zombies. I did use a mod that greatly decrease the amounts of materials you got looting and harvesting. For the first 4 Horde nights, I just used arrows and my traps / melee. The only time I brought out the guns is if I needed to thin the crowd some or had to deal with an annoying vulture (and this was more around Horde #3). Even after I started using guns more often (mostly hunting rifle for headshots), I did not go through a lot of ammo to defend myself.
The playstyle you are playing, you might need a ton of ammo to survive.; but it is not a requirement to do so (or specifically a need).
This is my experience too. In the first two weeks you don't need much ammo as the waves are depleted before the end of the hordenight. And with basic zombies melee cages are quite effective. There are lots of pois who can be used as one-off horde bases where it is simply your choice whether you shoot them with guns or simply whittle them down with arrows. Barbed wire is very effective in lengthening their time to approach so you always have less zombies to deal with at any moment.
@VictoriousIII: I can imagine your playstyle when you say you need 100 bullets per day in the first week. Contrast that with most people who use melee in the first days and use maybe 10, if at all. Naturally those players will not race up the level ladder as fast as you, but that is because you still have too much ammo (as you yourself noticed)
Now consider you had only half that amount of ammo. You would have to use melee on weekdays and build a horde base that saves you ammo, not just lead the zombies in front of your gun.