I bought some scope mounts and rings for my Savage 200 30-06 today. I basically went to a gun store and told the guy to set me up with what i needed. He sold me two mounts and a set of rings. I notice that one mount is thicker than the other. Could someone tell me why, and also which one should go in front or in back. A friend of mine says the thicker one goes in front because of the releif on the scope is bigger. He wasn't sure so I thought I would ask here.