As a baseline, choose a safe rated for at least double the number of guns you currently own.
Heavier safes are harder to steal. A good balance of size and security for most homeowners is the 750-lb range ; safes at this weight cannot be easily moved with a standard appliance dolly. how to buy a gun safe
Manufacturers often advertise capacity based on how many guns can physically fit if crammed together. In reality, a "24-gun safe" rarely fits 24 guns comfortably once you add scopes, bolt handles, and pistol grips. As a baseline, choose a safe rated for