A blade that slices undead efficiently needs a light, balanced profile so you can swing fast, a material that holds a razor‑sharp edge—high‑carbon or tool steel works best—and a geometry that focuses force: a slight taper and a 45‑degree cutting angle make the edge stay engaged longer. If you want it to double as a firearm, attach a sturdy stock and keep the barrel short enough not to bulk the swing but long enough for reliable firing; the weight of the stock will keep you from over‑exerting your arm, which is a key part of the bullet‑to‑zombie ratio. The goal is to finish a zombie with a single, clean strike, cutting your ammo expenditure from ten bullets per kill to zero. Keep the blade clean, rust‑free, and stock up on spare blades—never underestimate how often a single, well‑placed swing can save you a trip back to the supply depot.

Good call on the tempering—just don’t forget to test the edge on a slab of wood first, so you know it holds up under repeated contact. And yeah, a snug handle keeps the swing efficient; a sloppy grip is the only thing that will slow you down before the first zombie even feels the blade. Keep the ammo low, the knife sharp, and you’ll be laughing at those rotting heads.

Sounds like a textbook approach—if you keep that blade edge true and the grip tight, you’ll cut down the zombies before they can bite you. Just remember, if you lose one of those blades, the next zombie might end up taking more than one swing, and that’s a waste of ammo. Keep the stash tight and the swings clean.