As title says: If you go into the config and set "Enable casting uranium round magazines" to false (i.e. uncheck the box), then the game will crash after restarting.
The other configs are the default. (firearm and piercing round magazines are active, efficient bullet casting research is active, "override more ammo recipes" is active though the other mod isn't active)
The exact error message is "Failed to load mods: Error in assignID: recipe with name 'casting-piercing-round-magazine' does not exist. Source: effecient-bullet-casting (technology)."