I think that the Weaver Grand Slams are steel. I have used a set of Weaver #97 aluminum bases on a Remington with no problems. The aluminum Leupold Rifleman bases from Walmart are a waste of time. They are too soft and one set was drilled off center.
If I had to do it again I would get steel bases.
The best rings that I have found were recommended here: Burris Signature Zee rings. These have the plastic inserts between ring and scope. They are also Weaver style. You won't regret spending some more for the Burris rings.