I have a set of the Weaver Grand Slams, if you like Chinese cast iron tools, you'll love them, personally I'm not impressred with them, they're made in China and look like it, they took a lot of lapping to get them true enough to mount the scope in them, mounting a scope in them unlapped would be scopeicide!!

A much better choice would be Leupold PRWs, I have the same scope on my 500S&W Ultra mounted in them, they're rock solid and have stood up to some heavy recoil, 700gr @ 1430fps and 440gr @ 1900fps. See the scope mounting and low profile hammer mod links in the FAQs.
And Welcome to GBO!

Tim