Frosty, is this the type of base you're looking for?
http://www.midwayusa.com/product/248895/...wk-frame-silverMy original intent was to install a no-drill base on a well-used "base gun" SBH just to get it operational for the time being; the original plan for the gun was to eventually go to a custom 'smith for a full-on custom job sometime in the distant future.
It was a total disappointment, even with a lightweight red-dot. It kind-of-sort-of holds zero with mouse-fart .44 SPL, but beyond that, it will not. The only screw that really secures it from movement is the single screw that goes through the rear sight. I decided that the only way to make it worthwhile was to drill a few holes in the base and drill/tap some corresponding holes in the receiver or barrel to keep it from moving, as the base itself looks decent. In the end, after I got over the fear of weakening the receiver with the extra holes, I ended up buying this Weigand D&T mount:
http://www.jackweigand.com/raswms.html I D&T'd the 2 holes in the frame, mounted the red-dot, and have had no trouble since.