Reload Nginx Configuration

I am trying to modify the Nginx config file to remove a "rewrite".

Currently, I have this config file:

worker_processes  1;

events {
    worker_connections  1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    keepalive_timeout  65;
    server {
        listen      80;
        server_name amc.local;
        return 301 
    }
}

Now I want to reload this config file, I tried

nginx -s reload
nginx -c <conf file>
nginx -s stop/start

In the log file, there is the line

2014/01/22 11:25:25 [notice] 1310#0: signal process started

but the modifications are not loaded.