Checked my gamestage just now; it's 120. I believe it was 110 at the start of the horde. Currently, I am level 50; just maxed out Fortitude.
Luckily, I found 2 Rad Removers while looting, as well as the schematic to craft it. Plus, I found the book that allows me to craft drum magazines. I've yet to find the book that allows me to craft AP 7.62 ammo, though. :/
I currently have 30,000 coal sitting in storage. All I need is a boat load more nitrate, and brass. (I have no need to worry about lead; I have about 50k worth in several veins I found, sitting there, yet to be mined.)
Currently I am sitting at 3,500 7.62 ammo. I'll be spending the next week doing pretty much nothing but car wrenching sessions/brass loot runs. The zombies barely touched my base, only managing to destroy one block, so my base is surely secure for day 28. It's ammo that's my biggest concern right now.